Made Enigma gui translatable (#193)

* made enigma gui translatable

* key renamings

* missed strings

* string.format() & another missed string

* cached content (thanks @liach)

* added a dialog when changing language

* better sentence

* more %s

* liach's requests

* empty map

* the last (?) missed strings

* IT WORKS

* French translation

* Update fr_fr.json

26 files changed, 494 insertions, 108 deletions

diff --git a/src/main/java/cuchaz/enigma/Constants.java b/src/main/java/cuchaz/enigma/Constants.java
index afffb5d3..577315ff 100644
--- a/src/main/java/cuchaz/enigma/Constants.java
+++ b/src/main/java/cuchaz/enigma/Constants.java
@@ -14,7 +14,7 @@ package cuchaz.enigma;
 public class Constants {
         public static final String NAME = "Enigma";
         public static final String VERSION = "@VERSION@/Fabric";
-        public static final String URL = "https://fabric.asie.pl";
+        public static final String URL = "https://fabricmc.net";
         public static final int MiB = 1024 * 1024; // 1 mebibyte
         public static final int KiB = 1024; // 1 kebibyte
 }
diff --git a/src/main/java/cuchaz/enigma/EnigmaProject.java b/src/main/java/cuchaz/enigma/EnigmaProject.java
index 2a7ca988..fddacccf 100644
--- a/src/main/java/cuchaz/enigma/EnigmaProject.java
+++ b/src/main/java/cuchaz/enigma/EnigmaProject.java
@@ -19,6 +19,8 @@ import cuchaz.enigma.translation.representation.entry.ClassEntry;
 import cuchaz.enigma.translation.representation.entry.Entry;
 import cuchaz.enigma.translation.representation.entry.LocalVariableEntry;
 import cuchaz.enigma.translation.representation.entry.MethodEntry;
+import cuchaz.enigma.utils.I18n;
+
 import org.objectweb.asm.ClassWriter;
 import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.tree.ClassNode;
@@ -32,12 +34,10 @@ import java.nio.file.Path;
 import java.util.Collection;
 import java.util.Map;
 import java.util.Objects;
-import java.util.Optional;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.jar.JarEntry;
 import java.util.jar.JarOutputStream;
 import java.util.stream.Collectors;
-import java.util.stream.Stream;
 
 public class EnigmaProject {
         private final Enigma enigma;
@@ -148,7 +148,7 @@ public class EnigmaProject {
                 Translator deobfuscator = nameProposalServices.length == 0 ? mapper.getDeobfuscator() : new ProposingTranslator(mapper, nameProposalServices);
 
                 AtomicInteger count = new AtomicInteger();
-                progress.init(classEntries.size(), "Deobfuscating classes...");
+                progress.init(classEntries.size(), I18n.translate("progress.classes.deobfuscating"));
 
                 Map<String, ClassNode> compiled = classEntries.parallelStream()
                                 .map(entry -> {
@@ -180,7 +180,7 @@ public class EnigmaProject {
                 }
 
                 public void write(Path path, ProgressListener progress) throws IOException {
-                        progress.init(this.compiled.size(), "Writing jar...");
+                        progress.init(this.compiled.size(), I18n.translate("progress.jar.writing"));
 
                         try (JarOutputStream out = new JarOutputStream(Files.newOutputStream(path))) {
                                 AtomicInteger count = new AtomicInteger();
@@ -205,7 +205,7 @@ public class EnigmaProject {
                                         .filter(classNode -> classNode.name.indexOf('$') == -1)
                                         .collect(Collectors.toList());
 
-                        progress.init(classes.size(), "Decompiling classes...");
+                        progress.init(classes.size(), I18n.translate("progress.classes.decompiling"));
 
                         //create a common instance outside the loop as mappings shouldn't be changing while this is happening
                         CompiledSourceTypeLoader typeLoader = new CompiledSourceTypeLoader(this.compiled::get);
@@ -256,7 +256,7 @@ public class EnigmaProject {
                 }
 
                 public void write(Path path, ProgressListener progress) throws IOException {
-                        progress.init(decompiled.size(), "Writing sources...");
+                        progress.init(decompiled.size(), I18n.translate("progress.sources.writing"));
 
                         int count = 0;
                         for (ClassSource source : decompiled) {
diff --git a/src/main/java/cuchaz/enigma/Main.java b/src/main/java/cuchaz/enigma/Main.java
index dbbcee42..ceb5554b 100644
--- a/src/main/java/cuchaz/enigma/Main.java
+++ b/src/main/java/cuchaz/enigma/Main.java
@@ -14,6 +14,7 @@ package cuchaz.enigma;
 import cuchaz.enigma.gui.Gui;
 import cuchaz.enigma.gui.GuiController;
 import cuchaz.enigma.translation.mapping.serde.MappingFormat;
+
 import joptsimple.*;
 
 import java.io.BufferedReader;
diff --git a/src/main/java/cuchaz/enigma/analysis/index/JarIndex.java b/src/main/java/cuchaz/enigma/analysis/index/JarIndex.java
index 8e92dd86..c96e7747 100644
--- a/src/main/java/cuchaz/enigma/analysis/index/JarIndex.java
+++ b/src/main/java/cuchaz/enigma/analysis/index/JarIndex.java
@@ -20,6 +20,8 @@ import cuchaz.enigma.translation.mapping.EntryResolver;
 import cuchaz.enigma.translation.mapping.IndexEntryResolver;
 import cuchaz.enigma.translation.representation.Lambda;
 import cuchaz.enigma.translation.representation.entry.*;
+import cuchaz.enigma.utils.I18n;
+
 import org.objectweb.asm.ClassReader;
 import org.objectweb.asm.Opcodes;
 
@@ -58,18 +60,18 @@ public class JarIndex implements JarIndexer {
         }
 
         public void indexJar(ClassCache classCache, ProgressListener progress) {
-                progress.init(4, "Indexing jar");
+                progress.init(4, I18n.translate("progress.jar.indexing"));
 
-                progress.step(1, "Entries...");
+                progress.step(1, I18n.translate("progress.jar.indexing.entries"));
                 classCache.visit(() -> new IndexClassVisitor(this, Opcodes.ASM5), ClassReader.SKIP_CODE);
 
-                progress.step(2, "Entry references...");
+                progress.step(2, I18n.translate("progress.jar.indexing.references"));
                 classCache.visit(() -> new IndexReferenceVisitor(this, entryIndex, inheritanceIndex, Opcodes.ASM5), 0);
 
-                progress.step(3, "Bridge methods...");
+                progress.step(3, I18n.translate("progress.jar.indexing.methods"));
                 bridgeMethodIndex.findBridgeMethods();
 
-                progress.step(4, "Processing...");
+                progress.step(4, I18n.translate("progress.jar.indexing.process"));
                 processIndex(this);
         }
 
diff --git a/src/main/java/cuchaz/enigma/config/Config.java b/src/main/java/cuchaz/enigma/config/Config.java
index e2afb018..a00fe2df 100644
--- a/src/main/java/cuchaz/enigma/config/Config.java
+++ b/src/main/java/cuchaz/enigma/config/Config.java
@@ -4,6 +4,8 @@ import com.bulenkov.darcula.DarculaLaf;
 import com.google.common.io.Files;
 import com.google.gson.*;
 
+import cuchaz.enigma.utils.I18n;
+
 import javax.swing.*;
 import javax.swing.plaf.metal.MetalLookAndFeel;
 import java.awt.*;
@@ -165,6 +167,8 @@ public class Config {
         public Integer lineNumbersBackground;
         public Integer lineNumbersSelected;
         public Integer lineNumbersForeground;
+        
+        public String language = I18n.DEFAULT_LANGUAGE;
 
         public LookAndFeel lookAndFeel = LookAndFeel.DEFAULT;
 
@@ -213,6 +217,7 @@ public class Config {
         public void reset() throws IOException {
                 this.lookAndFeel = LookAndFeel.DEFAULT;
                 this.lookAndFeel.apply(this);
+                this.language = I18n.DEFAULT_LANGUAGE;
                 this.saveConfig();
         }
 
diff --git a/src/main/java/cuchaz/enigma/gui/Gui.java b/src/main/java/cuchaz/enigma/gui/Gui.java
index 1ea3e44f..5eeb07de 100644
--- a/src/main/java/cuchaz/enigma/gui/Gui.java
+++ b/src/main/java/cuchaz/enigma/gui/Gui.java
@@ -36,6 +36,7 @@ import cuchaz.enigma.gui.util.History;
 import cuchaz.enigma.throwables.IllegalNameException;
 import cuchaz.enigma.translation.mapping.*;
 import cuchaz.enigma.translation.representation.entry.*;
+import cuchaz.enigma.utils.I18n;
 import cuchaz.enigma.utils.Utils;
 import de.sciss.syntaxpane.DefaultSyntaxKit;
 
@@ -120,12 +121,12 @@ public class Gui {
                 this.controller = new GuiController(this, profile);
 
                 // init file choosers
-                this.jarFileChooser = new FileDialog(getFrame(), "Open Jar", FileDialog.LOAD);
+                this.jarFileChooser = new FileDialog(getFrame(), I18n.translate("menu.file.jar.open"), FileDialog.LOAD);
 
                 this.tinyMappingsFileChooser = new FileDialog(getFrame(), "Open tiny Mappings", FileDialog.LOAD);
                 this.enigmaMappingsFileChooser = new FileChooserAny();
                 this.exportSourceFileChooser = new FileChooserFolder();
-                this.exportJarFileChooser = new FileDialog(getFrame(), "Export jar", FileDialog.SAVE);
+                this.exportJarFileChooser = new FileDialog(getFrame(), I18n.translate("menu.file.export.jar"), FileDialog.SAVE);
 
                 this.obfPanel = new PanelObf(this);
                 this.deobfPanel = new PanelDeobf(this);
@@ -275,9 +276,9 @@ public class Gui {
                 centerPanel.add(sourceScroller, BorderLayout.CENTER);
                 tabs = new JTabbedPane();
                 tabs.setPreferredSize(new Dimension(250, 0));
-                tabs.addTab("Inheritance", inheritancePanel);
-                tabs.addTab("Implementations", implementationsPanel);
-                tabs.addTab("Call Graph", callPanel);
+                tabs.addTab(I18n.translate("info_panel.tree.inheritance"), inheritancePanel);
+                tabs.addTab(I18n.translate("info_panel.tree.implementations"), implementationsPanel);
+                tabs.addTab(I18n.translate("info_panel.tree.calls"), callPanel);
                 JSplitPane splitRight = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, true, centerPanel, tabs);
                 splitRight.setResizeWeight(1); // let the left side take all the slack
                 splitRight.resetToPreferredSizes();
@@ -458,33 +459,33 @@ public class Gui {
         }
 
         private void showLocalVariableEntry(LocalVariableEntry entry) {
-                addNameValue(infoPanel, "Variable", entry.getName());
-                addNameValue(infoPanel, "Class", entry.getContainingClass().getFullName());
-                addNameValue(infoPanel, "Method", entry.getParent().getName());
-                addNameValue(infoPanel, "Index", Integer.toString(entry.getIndex()));
+                addNameValue(infoPanel, I18n.translate("info_panel.identifier.variable"), entry.getName());
+                addNameValue(infoPanel, I18n.translate("info_panel.identifier.class"), entry.getContainingClass().getFullName());
+                addNameValue(infoPanel, I18n.translate("info_panel.identifier.method"), entry.getParent().getName());
+                addNameValue(infoPanel, I18n.translate("info_panel.identifier.index"), Integer.toString(entry.getIndex()));
         }
 
         private void showClassEntry(ClassEntry entry) {
-                addNameValue(infoPanel, "Class", entry.getFullName());
-                addModifierComboBox(infoPanel, "Modifier", entry);
+                addNameValue(infoPanel, I18n.translate("info_panel.identifier.class"), entry.getFullName());
+                addModifierComboBox(infoPanel, I18n.translate("info_panel.identifier.modifier"), entry);
         }
 
         private void showFieldEntry(FieldEntry entry) {
-                addNameValue(infoPanel, "Field", entry.getName());
-                addNameValue(infoPanel, "Class", entry.getParent().getFullName());
-                addNameValue(infoPanel, "TypeDescriptor", entry.getDesc().toString());
-                addModifierComboBox(infoPanel, "Modifier", entry);
+                addNameValue(infoPanel, I18n.translate("info_panel.identifier.field"), entry.getName());
+                addNameValue(infoPanel, I18n.translate("info_panel.identifier.class"), entry.getParent().getFullName());
+                addNameValue(infoPanel, I18n.translate("info_panel.identifier.type_descriptor"), entry.getDesc().toString());
+                addModifierComboBox(infoPanel, I18n.translate("info_panel.identifier.modifier"), entry);
         }
 
         private void showMethodEntry(MethodEntry entry) {
                 if (entry.isConstructor()) {
-                        addNameValue(infoPanel, "Constructor", entry.getParent().getFullName());
+                        addNameValue(infoPanel, I18n.translate("info_panel.identifier.constructor"), entry.getParent().getFullName());
                 } else {
-                        addNameValue(infoPanel, "Method", entry.getName());
-                        addNameValue(infoPanel, "Class", entry.getParent().getFullName());
+                        addNameValue(infoPanel, I18n.translate("info_panel.identifier.method"), entry.getName());
+                        addNameValue(infoPanel, I18n.translate("info_panel.identifier.class"), entry.getParent().getFullName());
                 }
-                addNameValue(infoPanel, "MethodDescriptor", entry.getDesc().toString());
-                addModifierComboBox(infoPanel, "Modifier", entry);
+                addNameValue(infoPanel, I18n.translate("info_panel.identifier.method_descriptor"), entry.getDesc().toString());
+                addModifierComboBox(infoPanel, I18n.translate("info_panel.identifier.modifier"), entry);
         }
 
         private void addNameValue(JPanel container, String name, String value) {
@@ -573,9 +574,9 @@ public class Gui {
                 this.popupMenu.toggleMappingMenu.setEnabled(isRenamable);
 
                 if (isToken && !Objects.equals(referenceEntry, mapper.deobfuscate(referenceEntry))) {
-                        this.popupMenu.toggleMappingMenu.setText("Reset to obfuscated");
+                        this.popupMenu.toggleMappingMenu.setText(I18n.translate("popup_menu.reset_obfuscated"));
                 } else {
-                        this.popupMenu.toggleMappingMenu.setText("Mark as deobfuscated");
+                        this.popupMenu.toggleMappingMenu.setText(I18n.translate("popup_menu.mark_deobfuscated"));
                 }
         }
 
@@ -794,7 +795,7 @@ public class Gui {
         }
 
         public void showDiscardDiag(Function<Integer, Void> callback, String... options) {
-                int response = JOptionPane.showOptionDialog(this.frame, "Your mappings have not been saved yet. Do you want to save?", "Save your changes?", JOptionPane.YES_NO_CANCEL_OPTION,
+                int response = JOptionPane.showOptionDialog(this.frame, I18n.translate("prompt.close.summary"), I18n.translate("prompt.close.title"), JOptionPane.YES_NO_CANCEL_OPTION,
                                 JOptionPane.QUESTION_MESSAGE, null, options, options[2]);
                 callback.apply(response);
         }
@@ -820,7 +821,7 @@ public class Gui {
                                 }
 
                                 return null;
-                        }, "Save and exit", "Discard changes", "Cancel");
+                        }, I18n.translate("prompt.close.save"), I18n.translate("prompt.close.discard"), I18n.translate("prompt.close.cancel"));
                 }
         }
 
diff --git a/src/main/java/cuchaz/enigma/gui/GuiController.java b/src/main/java/cuchaz/enigma/gui/GuiController.java
index 0b2fe27d..dc5010cb 100644
--- a/src/main/java/cuchaz/enigma/gui/GuiController.java
+++ b/src/main/java/cuchaz/enigma/gui/GuiController.java
@@ -32,6 +32,7 @@ import cuchaz.enigma.translation.representation.entry.ClassEntry;
 import cuchaz.enigma.translation.representation.entry.Entry;
 import cuchaz.enigma.translation.representation.entry.FieldEntry;
 import cuchaz.enigma.translation.representation.entry.MethodEntry;
+import cuchaz.enigma.utils.I18n;
 import cuchaz.enigma.utils.ReadableToken;
 import cuchaz.enigma.utils.Utils;
 import org.objectweb.asm.Opcodes;
@@ -391,7 +392,7 @@ public class GuiController {
                 boolean requiresDecompile = forceDecomp || currentSource == null || !currentSource.getEntry().equals(targetClass);
                 if (requiresDecompile) {
                         currentSource = null; // Or the GUI may try to find a nonexistent token
-                        gui.setEditorText("(decompiling...)");
+                        gui.setEditorText(I18n.translate("info_panel.editor.class.decompiling"));
                 }
 
                 DECOMPILER_SERVICE.submit(() -> {
@@ -413,7 +414,7 @@ public class GuiController {
                 try {
                         CompilationUnit sourceTree = (CompilationUnit) sourceProvider.getSources(targetClass.getFullName()).clone();
                         if (sourceTree == null) {
-                                gui.setEditorText("Unable to find class: " + targetClass);
+                                gui.setEditorText(I18n.translate("info_panel.editor.class.not_found") + " " + targetClass);
                                 return DecompiledClassSource.text(targetClass, "Unable to find class");
                         }
 
diff --git a/src/main/java/cuchaz/enigma/gui/dialog/AboutDialog.java b/src/main/java/cuchaz/enigma/gui/dialog/AboutDialog.java
index 7b3234d8..82fd6a5c 100644
--- a/src/main/java/cuchaz/enigma/gui/dialog/AboutDialog.java
+++ b/src/main/java/cuchaz/enigma/gui/dialog/AboutDialog.java
@@ -12,6 +12,7 @@
 package cuchaz.enigma.gui.dialog;
 
 import cuchaz.enigma.Constants;
+import cuchaz.enigma.utils.I18n;
 import cuchaz.enigma.utils.Utils;
 
 import javax.swing.*;
@@ -22,7 +23,7 @@ public class AboutDialog {
 
         public static void show(JFrame parent) {
                 // init frame
-                final JFrame frame = new JFrame(Constants.NAME + " - About");
+                final JFrame frame = new JFrame(String.format(I18n.translate("menu.help.about.title"), Constants.NAME));
                 final Container pane = frame.getContentPane();
                 pane.setLayout(new FlowLayout());
 
@@ -52,7 +53,7 @@ public class AboutDialog {
                 pane.add(linkPanel);
 
                 // show ok button
-                JButton okButton = new JButton("Ok");
+                JButton okButton = new JButton(I18n.translate("menu.help.about.ok"));
                 pane.add(okButton);
                 okButton.addActionListener(arg0 -> frame.dispose());
 
diff --git a/src/main/java/cuchaz/enigma/gui/dialog/CrashDialog.java b/src/main/java/cuchaz/enigma/gui/dialog/CrashDialog.java
index 04dd5d7b..7e66ecde 100644
--- a/src/main/java/cuchaz/enigma/gui/dialog/CrashDialog.java
+++ b/src/main/java/cuchaz/enigma/gui/dialog/CrashDialog.java
@@ -12,6 +12,7 @@
 package cuchaz.enigma.gui.dialog;
 
 import cuchaz.enigma.Constants;
+import cuchaz.enigma.utils.I18n;
 import cuchaz.enigma.utils.Utils;
 
 import javax.swing.*;
@@ -28,11 +29,11 @@ public class CrashDialog {
 
         private CrashDialog(JFrame parent) {
                 // init frame
-                frame = new JFrame(Constants.NAME + " - Crash Report");
+                frame = new JFrame(String.format(I18n.translate("crash.title"), Constants.NAME));
                 final Container pane = frame.getContentPane();
                 pane.setLayout(new BorderLayout());
 
-                JLabel label = new JLabel(Constants.NAME + " has crashed! =(");
+                JLabel label = new JLabel(String.format(I18n.translate("crash.summary"), Constants.NAME));
                 label.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
                 pane.add(label, BorderLayout.NORTH);
 
@@ -46,14 +47,14 @@ public class CrashDialog {
                 FlowLayout buttonsLayout = new FlowLayout();
                 buttonsLayout.setAlignment(FlowLayout.RIGHT);
                 buttonsPanel.setLayout(buttonsLayout);
-                buttonsPanel.add(Utils.unboldLabel(new JLabel("If you choose exit, you will lose any unsaved work.")));
-                JButton ignoreButton = new JButton("Ignore");
+                buttonsPanel.add(Utils.unboldLabel(new JLabel(I18n.translate("crash.exit.warning"))));
+                JButton ignoreButton = new JButton(I18n.translate("crash.ignore"));
                 ignoreButton.addActionListener(event -> {
                         // close (hide) the dialog
                         frame.setVisible(false);
                 });
                 buttonsPanel.add(ignoreButton);
-                JButton exitButton = new JButton("Exit");
+                JButton exitButton = new JButton(I18n.translate("crash.exit"));
                 exitButton.addActionListener(event -> {
                         // exit enigma
                         System.exit(1);
diff --git a/src/main/java/cuchaz/enigma/gui/dialog/JavadocDialog.java b/src/main/java/cuchaz/enigma/gui/dialog/JavadocDialog.java
index 84e4d8fc..57811eef 100644
--- a/src/main/java/cuchaz/enigma/gui/dialog/JavadocDialog.java
+++ b/src/main/java/cuchaz/enigma/gui/dialog/JavadocDialog.java
@@ -11,6 +11,7 @@
 
 package cuchaz.enigma.gui.dialog;
 
+import cuchaz.enigma.utils.I18n;
 import cuchaz.enigma.utils.Utils;
 
 import javax.swing.*;
@@ -26,7 +27,7 @@ public class JavadocDialog {
 
         private JavadocDialog(JFrame parent, JTextArea text, Callback callback) {
                 // init frame
-                frame = new JFrame("Edit Javadocs");
+                frame = new JFrame(I18n.translate("javadocs.edit"));
                 final Container pane = frame.getContentPane();
                 pane.setLayout(new BorderLayout());
 
@@ -55,14 +56,14 @@ public class JavadocDialog {
                 FlowLayout buttonsLayout = new FlowLayout();
                 buttonsLayout.setAlignment(FlowLayout.RIGHT);
                 buttonsPanel.setLayout(buttonsLayout);
-                buttonsPanel.add(Utils.unboldLabel(new JLabel("Edit javadocs here.")));
-                JButton cancelButton = new JButton("Cancel");
+                buttonsPanel.add(Utils.unboldLabel(new JLabel(I18n.translate("javadocs.instruction"))));
+                JButton cancelButton = new JButton(I18n.translate("javadocs.cancel"));
                 cancelButton.addActionListener(event -> {
                         // close (hide) the dialog
                         callback.closeUi(frame, false);
                 });
                 buttonsPanel.add(cancelButton);
-                JButton saveButton = new JButton("Save");
+                JButton saveButton = new JButton(I18n.translate("javadocs.save"));
                 saveButton.addActionListener(event -> {
                         // exit enigma
                         callback.closeUi(frame, true);
diff --git a/src/main/java/cuchaz/enigma/gui/dialog/ProgressDialog.java b/src/main/java/cuchaz/enigma/gui/dialog/ProgressDialog.java
index ae30667c..6d9a4198 100644
--- a/src/main/java/cuchaz/enigma/gui/dialog/ProgressDialog.java
+++ b/src/main/java/cuchaz/enigma/gui/dialog/ProgressDialog.java
@@ -13,6 +13,7 @@ package cuchaz.enigma.gui.dialog;
 
 import cuchaz.enigma.Constants;
 import cuchaz.enigma.ProgressListener;
+import cuchaz.enigma.utils.I18n;
 import cuchaz.enigma.utils.Utils;
 
 import javax.swing.*;
@@ -29,7 +30,7 @@ public class ProgressDialog implements ProgressListener, AutoCloseable {
         public ProgressDialog(JFrame parent) {
 
                 // init frame
-                this.frame = new JFrame(Constants.NAME + " - Operation in progress");
+                this.frame = new JFrame(String.format(I18n.translate("progress.operation"), Constants.NAME));
                 final Container pane = this.frame.getContentPane();
                 FlowLayout layout = new FlowLayout();
                 layout.setAlignment(FlowLayout.LEFT);
diff --git a/src/main/java/cuchaz/enigma/gui/dialog/SearchDialog.java b/src/main/java/cuchaz/enigma/gui/dialog/SearchDialog.java
index 1657d7b3..47f9149d 100644
--- a/src/main/java/cuchaz/enigma/gui/dialog/SearchDialog.java
+++ b/src/main/java/cuchaz/enigma/gui/dialog/SearchDialog.java
@@ -14,6 +14,7 @@ package cuchaz.enigma.gui.dialog;
 import com.google.common.collect.Lists;
 import cuchaz.enigma.gui.Gui;
 import cuchaz.enigma.translation.representation.entry.ClassEntry;
+import cuchaz.enigma.utils.I18n;
 import me.xdrop.fuzzywuzzy.FuzzySearch;
 import me.xdrop.fuzzywuzzy.model.ExtractedResult;
 
@@ -45,7 +46,7 @@ public class SearchDialog {
         }
 
         public void show() {
-                frame = new JFrame("Search");
+                frame = new JFrame(I18n.translate("menu.view.search"));
                 frame.setVisible(false);
                 JPanel pane = new JPanel();
                 pane.setBorder(new EmptyBorder(5, 10, 5, 10));
diff --git a/src/main/java/cuchaz/enigma/gui/elements/MenuBar.java b/src/main/java/cuchaz/enigma/gui/elements/MenuBar.java
index cdcad05c..50f0849f 100644
--- a/src/main/java/cuchaz/enigma/gui/elements/MenuBar.java
+++ b/src/main/java/cuchaz/enigma/gui/elements/MenuBar.java
@@ -7,7 +7,7 @@ import cuchaz.enigma.gui.dialog.AboutDialog;
 import cuchaz.enigma.gui.dialog.SearchDialog;
 import cuchaz.enigma.gui.stats.StatsMember;
 import cuchaz.enigma.translation.mapping.serde.MappingFormat;
-import cuchaz.enigma.utils.Utils;
+import cuchaz.enigma.utils.I18n;
 
 import javax.swing.*;
 import java.awt.*;
@@ -40,10 +40,10 @@ public class MenuBar extends JMenuBar {
                 this.gui = gui;
 
                 {
-                        JMenu menu = new JMenu("File");
+                        JMenu menu = new JMenu(I18n.translate("menu.file"));
                         this.add(menu);
                         {
-                                JMenuItem item = new JMenuItem("Open Jar...");
+                                JMenuItem item = new JMenuItem(I18n.translate("menu.file.jar.open"));
                                 menu.add(item);
                                 item.addActionListener(event -> {
                                         this.gui.jarFileChooser.setVisible(true);
@@ -54,19 +54,19 @@ public class MenuBar extends JMenuBar {
                                 });
                         }
                         {
-                                JMenuItem item = new JMenuItem("Close Jar");
+                                JMenuItem item = new JMenuItem(I18n.translate("menu.file.jar.close"));
                                 menu.add(item);
                                 item.addActionListener(event -> this.gui.getController().closeJar());
                                 this.closeJarMenu = item;
                         }
                         menu.addSeparator();
-                        JMenu openMenu = new JMenu("Open Mappings...");
+                        JMenu openMenu = new JMenu(I18n.translate("menu.file.mappings.open"));
                         menu.add(openMenu);
                         {
                                 openMappingsMenus = new ArrayList<>();
                                 for (MappingFormat format : MappingFormat.values()) {
                                         if (format.getReader() != null) {
-                                                JMenuItem item = new JMenuItem(Utils.caplisiseCamelCase(format.name()));
+                                                JMenuItem item = new JMenuItem(I18n.translate("mapping_format." + format.name().toLowerCase(Locale.ROOT)));
                                                 openMenu.add(item);
                                                 item.addActionListener(event -> {
                                                         if (this.gui.enigmaMappingsFileChooser.showOpenDialog(this.gui.getFrame()) == JFileChooser.APPROVE_OPTION) {
@@ -79,7 +79,7 @@ public class MenuBar extends JMenuBar {
                                 }
                         }
                         {
-                                JMenuItem item = new JMenuItem("Save Mappings");
+                                JMenuItem item = new JMenuItem(I18n.translate("menu.file.mappings.save"));
                                 menu.add(item);
                                 item.addActionListener(event -> {
                                         this.gui.getController().saveMappings(this.gui.enigmaMappingsFileChooser.getSelectedFile().toPath());
@@ -87,13 +87,13 @@ public class MenuBar extends JMenuBar {
                                 item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_DOWN_MASK));
                                 this.saveMappingsMenu = item;
                         }
-                        JMenu saveMenu = new JMenu("Save Mappings As...");
+                        JMenu saveMenu = new JMenu(I18n.translate("menu.file.mappings.save_as"));
                         menu.add(saveMenu);
                         {
                                 saveMappingsMenus = new ArrayList<>();
                                 for (MappingFormat format : MappingFormat.values()) {
                                         if (format.getWriter() != null) {
-                                                JMenuItem item = new JMenuItem(Utils.caplisiseCamelCase(format.name()));
+                                                JMenuItem item = new JMenuItem(I18n.translate("mapping_format." + format.name().toLowerCase(Locale.ROOT)));
                                                 saveMenu.add(item);
                                                 item.addActionListener(event -> {
                                                         // TODO: Use a specific file chooser for it
@@ -107,7 +107,7 @@ public class MenuBar extends JMenuBar {
                                 }
                         }
                         {
-                                JMenuItem item = new JMenuItem("Close Mappings");
+                                JMenuItem item = new JMenuItem(I18n.translate("menu.file.mappings.close"));
                                 menu.add(item);
                                 item.addActionListener(event -> {
                                         if (this.gui.getController().isDirty()) {
@@ -118,7 +118,7 @@ public class MenuBar extends JMenuBar {
                                                         } else if (response == JOptionPane.NO_OPTION)
                                                                 this.gui.getController().closeMappings();
                                                         return null;
-                                                }), "Save and close", "Discard changes", "Cancel");
+                                                }), I18n.translate("prompt.close.save"), I18n.translate("prompt.close.discard"), I18n.translate("prompt.close.cancel"));
                                         } else
                                                 this.gui.getController().closeMappings();
 
@@ -126,14 +126,14 @@ public class MenuBar extends JMenuBar {
                                 this.closeMappingsMenu = item;
                         }
                         {
-                                JMenuItem item = new JMenuItem("Drop Invalid Mappings");
+                                JMenuItem item = new JMenuItem(I18n.translate("menu.file.mappings.drop"));
                                 menu.add(item);
                                 item.addActionListener(event -> this.gui.getController().dropMappings());
                                 this.dropMappingsMenu = item;
                         }
                         menu.addSeparator();
                         {
-                                JMenuItem item = new JMenuItem("Export Source...");
+                                JMenuItem item = new JMenuItem(I18n.translate("menu.file.export.source"));
                                 menu.add(item);
                                 item.addActionListener(event -> {
                                         if (this.gui.exportSourceFileChooser.showSaveDialog(this.gui.getFrame()) == JFileChooser.APPROVE_OPTION) {
@@ -143,7 +143,7 @@ public class MenuBar extends JMenuBar {
                                 this.exportSourceMenu = item;
                         }
                         {
-                                JMenuItem item = new JMenuItem("Export Jar...");
+                                JMenuItem item = new JMenuItem(I18n.translate("menu.file.export.jar"));
                                 menu.add(item);
                                 item.addActionListener(event -> {
                                         this.gui.exportJarFileChooser.setVisible(true);
@@ -156,22 +156,22 @@ public class MenuBar extends JMenuBar {
                         }
                         menu.addSeparator();
                         {
-                                JMenuItem stats = new JMenuItem("Mapping Stats...");
+                                JMenuItem stats = new JMenuItem(I18n.translate("menu.file.stats"));
 
                                 stats.addActionListener(event -> {
-                    JFrame frame = new JFrame("Choose Included Members");
+                    JFrame frame = new JFrame(I18n.translate("menu.file.stats.title"));
                                         Container pane = frame.getContentPane();
                                         pane.setLayout(new FlowLayout());
 
                                         Map<StatsMember, JCheckBox> checkboxes = Arrays
                                                         .stream(StatsMember.values())
                                                         .collect(Collectors.toMap(m -> m, m -> {
-                                                                JCheckBox checkbox = new JCheckBox(Utils.caplisiseCamelCase(m.name()));
+                                                                JCheckBox checkbox = new JCheckBox(I18n.translate("type." + m.name().toLowerCase(Locale.ROOT)));
                                                                 pane.add(checkbox);
                                                                 return checkbox;
                                                         }));
 
-                                        JButton button = new JButton("Generate Stats");
+                                        JButton button = new JButton(I18n.translate("menu.file.stats.generate"));
 
                                         button.addActionListener(e -> {
                                                 Set<StatsMember> includedMembers = checkboxes
@@ -195,24 +195,53 @@ public class MenuBar extends JMenuBar {
                         }
                         menu.addSeparator();
                         {
-                                JMenuItem item = new JMenuItem("Exit");
+                                JMenuItem item = new JMenuItem(I18n.translate("menu.file.exit"));
                                 menu.add(item);
                                 item.addActionListener(event -> this.gui.close());
                         }
                 }
                 {
-                        JMenu menu = new JMenu("View");
+                        JMenu menu = new JMenu(I18n.translate("menu.view"));
                         this.add(menu);
                         {
-                                JMenu themes = new JMenu("Themes");
+                                JMenu themes = new JMenu(I18n.translate("menu.view.themes"));
                                 menu.add(themes);
                                 for (Config.LookAndFeel lookAndFeel : Config.LookAndFeel.values()) {
-                                        JMenuItem theme = new JMenuItem(lookAndFeel.getName());
+                                        JMenuItem theme = new JMenuItem(I18n.translate("menu.view.themes." + lookAndFeel.name().toLowerCase(Locale.ROOT)));
                                         themes.add(theme);
                                         theme.addActionListener(event -> Themes.setLookAndFeel(gui, lookAndFeel));
                                 }
+                                
+                                JMenu languages = new JMenu(I18n.translate("menu.view.languages"));
+                                menu.add(languages);
+                                for (String lang : I18n.getAvailableLanguages()) {
+                                        JMenuItem language = new JMenuItem(I18n.getLanguageName(lang));
+                                        languages.add(language);
+                                        language.addActionListener(event -> I18n.setLanguage(lang));
+                                        language.addActionListener(event -> {
+                                                JFrame frame = new JFrame(I18n.translate("menu.view.languages.title"));
+                                                Container pane = frame.getContentPane();
+                                                pane.setLayout(new FlowLayout());
+                                                
+                                                JLabel text = new JLabel((I18n.translate("menu.view.languages.summary")));
+                                                text.setHorizontalAlignment(JLabel.CENTER);
+                                                pane.add(text);
+                                                
+                                                JButton okButton = new JButton(I18n.translate("menu.view.languages.ok"));
+                                                okButton.setAlignmentX(JButton.CENTER_ALIGNMENT);
+                                                okButton.setHorizontalAlignment(JButton.CENTER);
+                                                pane.add(okButton);
+                                                okButton.addActionListener(arg0 -> frame.dispose());
+                                                
+                                                frame.setSize(350, 110);
+                                                frame.setResizable(false);
+                                                frame.setLocationRelativeTo(this.gui.getFrame());
+                                                frame.setVisible(true);
+                                                frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
+                                        });
+                                }
 
-                                JMenuItem search = new JMenuItem("Search");
+                                JMenuItem search = new JMenuItem(I18n.translate("menu.view.search"));
                                 search.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, InputEvent.SHIFT_MASK));
                                 menu.add(search);
                                 search.addActionListener(event -> {
@@ -224,15 +253,15 @@ public class MenuBar extends JMenuBar {
                         }
                 }
                 {
-                        JMenu menu = new JMenu("Help");
+                        JMenu menu = new JMenu(I18n.translate("menu.help"));
                         this.add(menu);
                         {
-                                JMenuItem item = new JMenuItem("About");
+                                JMenuItem item = new JMenuItem(I18n.translate("menu.help.about"));
                                 menu.add(item);
                                 item.addActionListener(event -> AboutDialog.show(this.gui.getFrame()));
                         }
                         {
-                                JMenuItem item = new JMenuItem("GitHub Page");
+                                JMenuItem item = new JMenuItem(I18n.translate("menu.help.github"));
                                 menu.add(item);
                                 item.addActionListener(event -> {
                                         try {
diff --git a/src/main/java/cuchaz/enigma/gui/elements/PopupMenuBar.java b/src/main/java/cuchaz/enigma/gui/elements/PopupMenuBar.java
index b9d459f3..b0fb2b04 100644
--- a/src/main/java/cuchaz/enigma/gui/elements/PopupMenuBar.java
+++ b/src/main/java/cuchaz/enigma/gui/elements/PopupMenuBar.java
@@ -1,6 +1,7 @@
 package cuchaz.enigma.gui.elements;
 
 import cuchaz.enigma.gui.Gui;
+import cuchaz.enigma.utils.I18n;
 
 import javax.swing.*;
 import java.awt.event.InputEvent;
@@ -21,7 +22,7 @@ public class PopupMenuBar extends JPopupMenu {
 
         public PopupMenuBar(Gui gui) {
                 {
-                        JMenuItem menu = new JMenuItem("Rename");
+                        JMenuItem menu = new JMenuItem(I18n.translate("popup_menu.rename"));
                         menu.addActionListener(event -> gui.startRename());
                         menu.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_R, 0));
                         menu.setEnabled(false);
@@ -29,7 +30,7 @@ public class PopupMenuBar extends JPopupMenu {
                         this.renameMenu = menu;
                 }
                 {
-                        JMenuItem menu = new JMenuItem("Edit Javadoc");
+                        JMenuItem menu = new JMenuItem(I18n.translate("popup_menu.javadoc"));
                         menu.addActionListener(event -> gui.startDocChange());
                         menu.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_D, 0));
                         menu.setEnabled(false);
@@ -37,7 +38,7 @@ public class PopupMenuBar extends JPopupMenu {
                         this.editJavadocMenu = menu;
                 }
                 {
-                        JMenuItem menu = new JMenuItem("Show Inheritance");
+                        JMenuItem menu = new JMenuItem(I18n.translate("popup_menu.inheritance"));
                         menu.addActionListener(event -> gui.showInheritance());
                         menu.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_I, 0));
                         menu.setEnabled(false);
@@ -45,7 +46,7 @@ public class PopupMenuBar extends JPopupMenu {
                         this.showInheritanceMenu = menu;
                 }
                 {
-                        JMenuItem menu = new JMenuItem("Show Implementations");
+                        JMenuItem menu = new JMenuItem(I18n.translate("popup_menu.implementations"));
                         menu.addActionListener(event -> gui.showImplementations());
                         menu.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_M, 0));
                         menu.setEnabled(false);
@@ -53,7 +54,7 @@ public class PopupMenuBar extends JPopupMenu {
                         this.showImplementationsMenu = menu;
                 }
                 {
-                        JMenuItem menu = new JMenuItem("Show Calls");
+                        JMenuItem menu = new JMenuItem(I18n.translate("popup_menu.calls"));
                         menu.addActionListener(event -> gui.showCalls(true));
                         menu.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, 0));
                         menu.setEnabled(false);
@@ -61,7 +62,7 @@ public class PopupMenuBar extends JPopupMenu {
                         this.showCallsMenu = menu;
                 }
                 {
-                        JMenuItem menu = new JMenuItem("Show Calls (Specific)");
+                        JMenuItem menu = new JMenuItem(I18n.translate("popup_menu.calls.specific"));
                         menu.addActionListener(event -> gui.showCalls(false));
                         menu.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, InputEvent.SHIFT_DOWN_MASK));
                         menu.setEnabled(false);
@@ -69,7 +70,7 @@ public class PopupMenuBar extends JPopupMenu {
                         this.showCallsSpecificMenu = menu;
                 }
                 {
-                        JMenuItem menu = new JMenuItem("Go to Declaration");
+                        JMenuItem menu = new JMenuItem(I18n.translate("popup_menu.declaration"));
                         menu.addActionListener(event -> gui.getController().navigateTo(gui.cursorReference.entry));
                         menu.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, 0));
                         menu.setEnabled(false);
@@ -77,7 +78,7 @@ public class PopupMenuBar extends JPopupMenu {
                         this.openEntryMenu = menu;
                 }
                 {
-                        JMenuItem menu = new JMenuItem("Go back");
+                        JMenuItem menu = new JMenuItem(I18n.translate("popup_menu.back"));
                         menu.addActionListener(event -> gui.getController().openPreviousReference());
                         menu.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_P, 0));
                         menu.setEnabled(false);
@@ -85,7 +86,7 @@ public class PopupMenuBar extends JPopupMenu {
                         this.openPreviousMenu = menu;
                 }
                 {
-                        JMenuItem menu = new JMenuItem("Go forward");
+                        JMenuItem menu = new JMenuItem(I18n.translate("popup_menu.forward"));
                         menu.addActionListener(event -> gui.getController().openNextReference());
                         menu.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E, 0));
                         menu.setEnabled(false);
@@ -93,7 +94,7 @@ public class PopupMenuBar extends JPopupMenu {
                         this.openNextMenu = menu;
                 }
                 {
-                        JMenuItem menu = new JMenuItem("Mark as deobfuscated");
+                        JMenuItem menu = new JMenuItem(I18n.translate("popup_menu.mark_deobfuscated"));
                         menu.addActionListener(event -> gui.toggleMapping());
                         menu.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, 0));
                         menu.setEnabled(false);
diff --git a/src/main/java/cuchaz/enigma/gui/panels/PanelDeobf.java b/src/main/java/cuchaz/enigma/gui/panels/PanelDeobf.java
index 2a4e2d74..c24226b3 100644
--- a/src/main/java/cuchaz/enigma/gui/panels/PanelDeobf.java
+++ b/src/main/java/cuchaz/enigma/gui/panels/PanelDeobf.java
@@ -2,6 +2,7 @@ package cuchaz.enigma.gui.panels;
 
 import cuchaz.enigma.gui.ClassSelector;
 import cuchaz.enigma.gui.Gui;
+import cuchaz.enigma.utils.I18n;
 
 import javax.swing.*;
 import java.awt.*;
@@ -19,7 +20,7 @@ public class PanelDeobf extends JPanel {
                 this.deobfClasses.setRenameSelectionListener(gui::onPanelRename);
 
                 this.setLayout(new BorderLayout());
-                this.add(new JLabel("De-obfuscated Classes"), BorderLayout.NORTH);
+                this.add(new JLabel(I18n.translate("info_panel.classes.deobfuscated")), BorderLayout.NORTH);
                 this.add(new JScrollPane(this.deobfClasses), BorderLayout.CENTER);
         }
 }
diff --git a/src/main/java/cuchaz/enigma/gui/panels/PanelIdentifier.java b/src/main/java/cuchaz/enigma/gui/panels/PanelIdentifier.java
index 1bf68879..0cca40d9 100644
--- a/src/main/java/cuchaz/enigma/gui/panels/PanelIdentifier.java
+++ b/src/main/java/cuchaz/enigma/gui/panels/PanelIdentifier.java
@@ -1,6 +1,7 @@
 package cuchaz.enigma.gui.panels;
 
 import cuchaz.enigma.gui.Gui;
+import cuchaz.enigma.utils.I18n;
 import cuchaz.enigma.utils.Utils;
 
 import javax.swing.*;
@@ -15,12 +16,12 @@ public class PanelIdentifier extends JPanel {
 
                 this.setLayout(new GridLayout(4, 1, 0, 0));
                 this.setPreferredSize(new Dimension(0, 100));
-                this.setBorder(BorderFactory.createTitledBorder("Identifier Info"));
+                this.setBorder(BorderFactory.createTitledBorder(I18n.translate("info_panel.identifier")));
         }
 
         public void clearReference() {
                 this.removeAll();
-                JLabel label = new JLabel("No identifier selected");
+                JLabel label = new JLabel(I18n.translate("info_panel.identifier.none"));
                 Utils.unboldLabel(label);
                 label.setHorizontalAlignment(JLabel.CENTER);
                 this.add(label);
diff --git a/src/main/java/cuchaz/enigma/gui/panels/PanelObf.java b/src/main/java/cuchaz/enigma/gui/panels/PanelObf.java
index 8ee564b5..dd7f9f97 100644
--- a/src/main/java/cuchaz/enigma/gui/panels/PanelObf.java
+++ b/src/main/java/cuchaz/enigma/gui/panels/PanelObf.java
@@ -3,6 +3,7 @@ package cuchaz.enigma.gui.panels;
 import cuchaz.enigma.gui.ClassSelector;
 import cuchaz.enigma.gui.Gui;
 import cuchaz.enigma.translation.representation.entry.ClassEntry;
+import cuchaz.enigma.utils.I18n;
 
 import javax.swing.*;
 import java.awt.*;
@@ -30,7 +31,7 @@ public class PanelObf extends JPanel {
                 this.obfClasses.setRenameSelectionListener(gui::onPanelRename);
 
                 this.setLayout(new BorderLayout());
-                this.add(new JLabel("Obfuscated Classes"), BorderLayout.NORTH);
+                this.add(new JLabel(I18n.translate("info_panel.classes.obfuscated")), BorderLayout.NORTH);
                 this.add(new JScrollPane(this.obfClasses), BorderLayout.CENTER);
         }
 }
diff --git a/src/main/java/cuchaz/enigma/gui/stats/StatsGenerator.java b/src/main/java/cuchaz/enigma/gui/stats/StatsGenerator.java
index a6e465d3..e7835304 100644
--- a/src/main/java/cuchaz/enigma/gui/stats/StatsGenerator.java
+++ b/src/main/java/cuchaz/enigma/gui/stats/StatsGenerator.java
@@ -11,6 +11,7 @@ import cuchaz.enigma.translation.mapping.EntryResolver;
 import cuchaz.enigma.translation.mapping.ResolutionStrategy;
 import cuchaz.enigma.translation.representation.TypeDescriptor;
 import cuchaz.enigma.translation.representation.entry.*;
+import cuchaz.enigma.utils.I18n;
 
 import java.util.*;
 
@@ -45,14 +46,14 @@ public class StatsGenerator {
             totalWork += entryIndex.getClasses().size();
         }
 
-        progress.init(totalWork, "Generating stats");
+        progress.init(totalWork, I18n.translate("progress.stats"));
 
         Map<String, Integer> counts = new HashMap<>();
 
         int numDone = 0;
         if (includedMembers.contains(StatsMember.METHODS) || includedMembers.contains(StatsMember.PARAMETERS)) {
             for (MethodEntry method : entryIndex.getMethods()) {
-                progress.step(numDone++, "Methods");
+                progress.step(numDone++, I18n.translate("type.methods"));
                 MethodEntry root = entryResolver
                         .resolveEntry(method, ResolutionStrategy.RESOLVE_ROOT)
                         .stream()
@@ -77,19 +78,19 @@ public class StatsGenerator {
 
         if (includedMembers.contains(StatsMember.FIELDS)) {
             for (FieldEntry field : entryIndex.getFields()) {
-                progress.step(numDone++, "Fields");
+                progress.step(numDone++, I18n.translate("type.fields"));
                 update(counts, field);
             }
         }
 
         if (includedMembers.contains(StatsMember.CLASSES)) {
             for (ClassEntry clazz : entryIndex.getClasses()) {
-                progress.step(numDone++, "Classes");
+                progress.step(numDone++, I18n.translate("type.classes"));
                 update(counts, clazz);
             }
         }
 
-        progress.step(-1, "Generating data");
+        progress.step(-1, I18n.translate("progress.stats.data"));
 
         Tree<Integer> tree = new Tree<>();
 
diff --git a/src/main/java/cuchaz/enigma/translation/mapping/serde/EnigmaMappingsReader.java b/src/main/java/cuchaz/enigma/translation/mapping/serde/EnigmaMappingsReader.java
index 5e49a2a4..60ce587d 100644
--- a/src/main/java/cuchaz/enigma/translation/mapping/serde/EnigmaMappingsReader.java
+++ b/src/main/java/cuchaz/enigma/translation/mapping/serde/EnigmaMappingsReader.java
@@ -12,6 +12,7 @@ import cuchaz.enigma.translation.mapping.tree.HashEntryTree;
 import cuchaz.enigma.translation.representation.MethodDescriptor;
 import cuchaz.enigma.translation.representation.TypeDescriptor;
 import cuchaz.enigma.translation.representation.entry.*;
+import cuchaz.enigma.utils.I18n;
 
 import javax.annotation.Nullable;
 import java.io.IOException;
@@ -28,12 +29,12 @@ public enum EnigmaMappingsReader implements MappingsReader {
         FILE {
                 @Override
                 public EntryTree<EntryMapping> read(Path path, ProgressListener progress, MappingSaveParameters saveParameters) throws IOException, MappingParseException {
-                        progress.init(1, "Loading mapping file");
+                        progress.init(1, I18n.translate("progress.mappings.enigma_file.loading"));
 
                         EntryTree<EntryMapping> mappings = new HashEntryTree<>();
                         readFile(path, mappings);
 
-                        progress.step(1, "Done!");
+                        progress.step(1, I18n.translate("progress.mappings.enigma_file.done"));
 
                         return mappings;
                 }
@@ -48,7 +49,7 @@ public enum EnigmaMappingsReader implements MappingsReader {
                                         .filter(f -> f.toString().endsWith(".mapping"))
                                         .collect(Collectors.toList());
 
-                        progress.init(files.size(), "Loading mapping files");
+                        progress.init(files.size(), I18n.translate("progress.mappings.enigma_directory.loading"));
                         int step = 0;
 
                         for (Path file : files) {
diff --git a/src/main/java/cuchaz/enigma/translation/mapping/serde/EnigmaMappingsWriter.java b/src/main/java/cuchaz/enigma/translation/mapping/serde/EnigmaMappingsWriter.java
index f490b1da..2ce1234a 100644
--- a/src/main/java/cuchaz/enigma/translation/mapping/serde/EnigmaMappingsWriter.java
+++ b/src/main/java/cuchaz/enigma/translation/mapping/serde/EnigmaMappingsWriter.java
@@ -40,6 +40,7 @@ import cuchaz.enigma.translation.representation.entry.Entry;
 import cuchaz.enigma.translation.representation.entry.FieldEntry;
 import cuchaz.enigma.translation.representation.entry.LocalVariableEntry;
 import cuchaz.enigma.translation.representation.entry.MethodEntry;
+import cuchaz.enigma.utils.I18n;
 import cuchaz.enigma.utils.LFPrintWriter;
 
 public enum EnigmaMappingsWriter implements MappingsWriter {
@@ -51,7 +52,7 @@ public enum EnigmaMappingsWriter implements MappingsWriter {
                                         .map(entry -> (ClassEntry) entry)
                                         .collect(Collectors.toList());
 
-                        progress.init(classes.size(), "Writing classes");
+                        progress.init(classes.size(), I18n.translate("progress.mappings.enigma_file.writing"));
 
                         int steps = 0;
                         try (PrintWriter writer = new LFPrintWriter(Files.newBufferedWriter(path))) {
@@ -74,7 +75,7 @@ public enum EnigmaMappingsWriter implements MappingsWriter {
 
                         applyDeletions(path, changedClasses, mappings, delta.getBaseMappings(), saveParameters.getFileNameFormat());
 
-                        progress.init(changedClasses.size(), "Writing classes");
+                        progress.init(changedClasses.size(), I18n.translate("progress.mappings.enigma_directory.writing"));
 
                         AtomicInteger steps = new AtomicInteger();
 
diff --git a/src/main/java/cuchaz/enigma/translation/mapping/serde/SrgMappingsWriter.java b/src/main/java/cuchaz/enigma/translation/mapping/serde/SrgMappingsWriter.java
index 1270d515..f67f8fcd 100644
--- a/src/main/java/cuchaz/enigma/translation/mapping/serde/SrgMappingsWriter.java
+++ b/src/main/java/cuchaz/enigma/translation/mapping/serde/SrgMappingsWriter.java
@@ -14,6 +14,7 @@ import cuchaz.enigma.translation.representation.entry.ClassEntry;
 import cuchaz.enigma.translation.representation.entry.Entry;
 import cuchaz.enigma.translation.representation.entry.FieldEntry;
 import cuchaz.enigma.translation.representation.entry.MethodEntry;
+import cuchaz.enigma.utils.I18n;
 import cuchaz.enigma.utils.LFPrintWriter;
 
 import java.io.IOException;
@@ -45,7 +46,7 @@ public enum SrgMappingsWriter implements MappingsWriter {
                 Collection<Entry<?>> rootEntries = Lists.newArrayList(mappings).stream()
                                 .map(EntryTreeNode::getEntry)
                                 .collect(Collectors.toList());
-                progress.init(rootEntries.size(), "Generating mappings");
+                progress.init(rootEntries.size(), I18n.translate("progress.mappings.srg_file.generating"));
 
                 int steps = 0;
                 for (Entry<?> entry : sorted(rootEntries)) {
@@ -53,13 +54,13 @@ public enum SrgMappingsWriter implements MappingsWriter {
                         writeEntry(classLines, fieldLines, methodLines, mappings, entry);
                 }
 
-                progress.init(3, "Writing mappings");
+                progress.init(3, I18n.translate("progress.mappings.srg_file.writing"));
                 try (PrintWriter writer = new LFPrintWriter(Files.newBufferedWriter(path))) {
-                        progress.step(0, "Classes");
+                        progress.step(0, I18n.translate("type.classes"));
                         classLines.forEach(writer::println);
-                        progress.step(1, "Fields");
+                        progress.step(1, I18n.translate("type.fields"));
                         fieldLines.forEach(writer::println);
-                        progress.step(2, "Methods");
+                        progress.step(2, I18n.translate("type.methods"));
                         methodLines.forEach(writer::println);
                 } catch (IOException e) {
                         e.printStackTrace();
diff --git a/src/main/java/cuchaz/enigma/translation/mapping/serde/TinyMappingsReader.java b/src/main/java/cuchaz/enigma/translation/mapping/serde/TinyMappingsReader.java
index aceb02f0..773c95eb 100644
--- a/src/main/java/cuchaz/enigma/translation/mapping/serde/TinyMappingsReader.java
+++ b/src/main/java/cuchaz/enigma/translation/mapping/serde/TinyMappingsReader.java
@@ -14,6 +14,7 @@ import cuchaz.enigma.translation.representation.entry.ClassEntry;
 import cuchaz.enigma.translation.representation.entry.FieldEntry;
 import cuchaz.enigma.translation.representation.entry.LocalVariableEntry;
 import cuchaz.enigma.translation.representation.entry.MethodEntry;
+import cuchaz.enigma.utils.I18n;
 
 import java.io.IOException;
 import java.nio.file.Files;
@@ -32,7 +33,7 @@ public enum TinyMappingsReader implements MappingsReader {
                 EntryTree<EntryMapping> mappings = new HashEntryTree<>();
                 lines.remove(0);
 
-                progress.init(lines.size(), "Loading mapping file");
+                progress.init(lines.size(), I18n.translate("progress.mappings.tiny_file.loading"));
 
                 for (int lineNumber = 0; lineNumber < lines.size(); lineNumber++) {
                         progress.step(lineNumber, "");
diff --git a/src/main/java/cuchaz/enigma/translation/mapping/serde/TinyV2Reader.java b/src/main/java/cuchaz/enigma/translation/mapping/serde/TinyV2Reader.java
index c0488e93..a47143a2 100644
--- a/src/main/java/cuchaz/enigma/translation/mapping/serde/TinyV2Reader.java
+++ b/src/main/java/cuchaz/enigma/translation/mapping/serde/TinyV2Reader.java
@@ -14,6 +14,7 @@ import cuchaz.enigma.translation.representation.entry.Entry;
 import cuchaz.enigma.translation.representation.entry.FieldEntry;
 import cuchaz.enigma.translation.representation.entry.LocalVariableEntry;
 import cuchaz.enigma.translation.representation.entry.MethodEntry;
+import cuchaz.enigma.utils.I18n;
 
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
@@ -45,7 +46,7 @@ final class TinyV2Reader implements MappingsReader {
         private EntryTree<EntryMapping> read(Path path, List<String> lines, ProgressListener progress) throws MappingParseException {
                 EntryTree<EntryMapping> mappings = new HashEntryTree<>();
 
-                progress.init(lines.size(), "Loading mapping file");
+                progress.init(lines.size(), I18n.translate("progress.mappings.tiny_v2.loading"));
 
                 BitSet state = new BitSet(STATE_SIZE);
                 @SuppressWarnings({"unchecked", "rawtypes"})
diff --git a/src/main/java/cuchaz/enigma/utils/I18n.java b/src/main/java/cuchaz/enigma/utils/I18n.java
new file mode 100644
index 00000000..f91c916a
--- /dev/null
+++ b/src/main/java/cuchaz/enigma/utils/I18n.java
@@ -0,0 +1,102 @@
+package cuchaz.enigma.utils;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Map;
+import java.util.stream.Stream;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Maps;
+import com.google.common.reflect.ClassPath;
+import com.google.common.reflect.ClassPath.ResourceInfo;
+import com.google.gson.Gson;
+
+import cuchaz.enigma.config.Config;
+
+public class I18n {
+        public static final String DEFAULT_LANGUAGE = "en_us";
+        private static final Gson GSON = new Gson();
+        private static Map<String, String> translations = Maps.newHashMap();
+        private static Map<String, String> defaultTranslations = Maps.newHashMap();
+        private static Map<String, String> languageNames = Maps.newHashMap();
+        
+        static {
+                translations = load(Config.getInstance().language);
+                defaultTranslations = load(DEFAULT_LANGUAGE);
+        }
+        
+        @SuppressWarnings("unchecked")
+        public static Map<String, String> load(String language) {
+                try (InputStream inputStream = I18n.class.getResourceAsStream("/lang/" + language + ".json")) {
+                        if (inputStream != null) {
+                                try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8))) {
+                                        return GSON.fromJson(reader, Map.class);
+                                }
+                        }
+                } catch (IOException e) {
+                        e.printStackTrace();
+                }
+                return Collections.emptyMap();
+        }
+        
+        public static String translate(String key) {
+                String value = translations.get(key);
+                if (value != null) {
+                        return value;
+                }
+                value = defaultTranslations.get(key);
+                if (value != null) {
+                        return value;
+                }
+                return key;
+        }
+        
+        public static String getLanguageName(String language) {
+                return languageNames.get(language);
+        }
+        
+        public static void setLanguage(String language) {
+                Config.getInstance().language = language;
+                try {
+                        Config.getInstance().saveConfig();
+                } catch (IOException e) {
+                        e.printStackTrace();
+                }
+        }
+        
+        public static ArrayList<String> getAvailableLanguages() {
+                ArrayList<String> list = new ArrayList<String>();
+                
+                try {
+                        ImmutableList<ResourceInfo> resources = ClassPath.from(Thread.currentThread().getContextClassLoader()).getResources().asList();
+                        Stream<ResourceInfo> dirStream = resources.stream();
+                        dirStream.forEach(context -> {
+                                String file = context.getResourceName();
+                                if (file.startsWith("lang/") && file.endsWith(".json")) {
+                                        String fileName = file.substring(5, file.length() - 5);
+                                        list.add(fileName);
+                                        loadLanguageName(fileName);
+                                }
+                        });
+                } catch (IOException e) {
+                        e.printStackTrace();
+                }
+                return list;
+        }
+        
+        private static void loadLanguageName(String fileName) {
+                try (InputStream stream = Thread.currentThread().getContextClassLoader().getResourceAsStream("lang/" + fileName + ".json")) {
+                        try (BufferedReader reader = new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8))) {
+                                Map<?, ?> map = GSON.fromJson(reader, Map.class);
+                                languageNames.put(fileName, map.get("language").toString());
+                        }
+                } catch (IOException e) {
+                        e.printStackTrace();
+                }
+        }
+}
diff --git a/src/main/resources/lang/en_us.json b/src/main/resources/lang/en_us.json
new file mode 100644
index 00000000..dbf3e451
--- /dev/null
+++ b/src/main/resources/lang/en_us.json
@@ -0,0 +1,115 @@
+{
+        "language": "English",
+
+        "mapping_format.enigma_file": "Enigma File",
+        "mapping_format.enigma_directory": "Enigma Directory",
+        "mapping_format.tiny_v2": "Tiny v2",
+        "mapping_format.tiny_file": "Tiny File",
+        "mapping_format.srg_file": "SRG File",
+        "mapping_format.proguard": "Proguard",
+        "type.methods": "Methods",
+        "type.fields": "Fields",
+        "type.parameters": "Parameters",
+        "type.classes": "Classes",
+
+        "menu.file": "File",
+        "menu.file.jar.open": "Open Jar...",
+        "menu.file.jar.close": "Close Jar",
+        "menu.file.mappings.open": "Open Mappings...",
+        "menu.file.mappings.save": "Save Mappings",
+        "menu.file.mappings.save_as": "Save Mappings As...",
+        "menu.file.mappings.close": "Close Mappings",
+        "menu.file.mappings.drop": "Drop Invalid Mappings",
+        "menu.file.export.source": "Export Source...",
+        "menu.file.export.jar": "Export Jar...",
+        "menu.file.stats": "Mapping Stats...",
+        "menu.file.stats.title": "Choose Included Members",
+        "menu.file.stats.generate": "Generate Stats",
+        "menu.file.exit": "Exit",
+        "menu.view": "View",
+        "menu.view.themes": "Themes",
+        "menu.view.themes.default": "Default",
+        "menu.view.themes.darcula": "Darcula",
+        "menu.view.themes.system": "System",
+        "menu.view.themes.none": "None (JVM Default)",
+        "menu.view.languages": "Languages",
+        "menu.view.languages.title": "Change language",
+        "menu.view.languages.summary": "The new language will be applied after the next restart.",
+        "menu.view.languages.ok": "Ok",
+        "menu.view.search": "Search",
+        "menu.help": "Help",
+        "menu.help.about": "About",
+        "menu.help.about.title": "%s - About",
+        "menu.help.about.ok": "Ok",
+        "menu.help.github": "Github Page",
+
+        "popup_menu.rename": "Rename",
+        "popup_menu.javadoc": "Edit Javadoc",
+        "popup_menu.inheritance": "Show Inheritance",
+        "popup_menu.implementations": "Show Implementations",
+        "popup_menu.calls": "Show Calls",
+        "popup_menu.calls.specific": "Show Calls (Specific)",
+        "popup_menu.declaration": "Go to Declaration",
+        "popup_menu.back": "Go back",
+        "popup_menu.forward": "Go forward",
+        "popup_menu.mark_deobfuscated": "Mark as deobfuscated",
+        "popup_menu.reset_obfuscated": "Reset to obfuscated",
+
+        "info_panel.classes.obfuscated": "Obfuscated Classes",
+        "info_panel.classes.deobfuscated": "De-obfuscated Classes",
+        "info_panel.identifier": "Identifier Info",
+        "info_panel.identifier.none": "No identifier selected",
+        "info_panel.identifier.variable": "Variable",
+        "info_panel.identifier.field": "Field",
+        "info_panel.identifier.method": "Method",
+        "info_panel.identifier.constructor": "Constructor",
+        "info_panel.identifier.class": "Class",
+        "info_panel.identifier.type_descriptor": "TypeDescriptor",
+        "info_panel.identifier.method_descriptor": "MethodDescriptor",
+        "info_panel.identifier.modifier": "Modifier",
+        "info_panel.identifier.index": "Index",
+        "info_panel.editor.class.decompiling": "(decompiling...)",
+        "info_panel.editor.class.not_found": "Unable to find class:",
+        "info_panel.tree.inheritance": "Inheritance",
+        "info_panel.tree.implementations": "Implementations",
+        "info_panel.tree.calls": "Call Graph",
+
+        "progress.operation": "%s - Operation in progress",
+        "progress.jar.indexing": "Indexing jar",
+        "progress.jar.indexing.entries": "Entries...",
+        "progress.jar.indexing.references": "Entry references...",
+        "progress.jar.indexing.methods": "Bridge methods...",
+        "progress.jar.indexing.process": "Processing...",
+        "progress.jar.writing": "Writing jar...",
+        "progress.sources.writing": "Writing sources...",
+        "progress.classes.deobfuscating": "Deobfuscating classes...",
+        "progress.classes.decompiling": "Decompiling classes...",
+        "progress.mappings.enigma_file.loading": "Loading mapping file",
+        "progress.mappings.enigma_file.done": "Done!",
+        "progress.mappings.enigma_file.writing": "Writing classes",
+        "progress.mappings.enigma_directory.loading": "Loading mapping files",
+        "progress.mappings.enigma_directory.writing": "Writing classes",
+        "progress.mappings.tiny_file.loading": "Loading mapping file",
+        "progress.mappings.tiny_v2.loading": "Loading mapping file",
+        "progress.mappings.srg_file.generating": "Generating mappings",
+        "progress.mappings.srg_file.writing": "Writing mappings",
+        "progress.stats": "Generating stats",
+        "progress.stats.data": "Generating data",
+
+        "javadocs.edit": "Edit Javadocs",
+        "javadocs.instruction": "Edit javadocs here.",
+        "javadocs.cancel": "Cancel",
+        "javadocs.save": "Save",
+
+        "prompt.close.title": "Save your changes?",
+        "prompt.close.summary": "Your mappings have not been saved yet. Do you want to save?",
+        "prompt.close.save": "Save and close",
+        "prompt.close.discard": "Discard changes",
+        "prompt.close.cancel": "Cancel",
+
+        "crash.title": "%s - Crash Report",
+        "crash.summary": "%s has crashed! =(",
+        "crash.ignore": "Ignore",
+        "crash.exit": "Exit",
+        "crash.exit.warning": "If you choose exit, you will lose any unsaved work."
+}
diff --git a/src/main/resources/lang/fr_fr.json b/src/main/resources/lang/fr_fr.json
new file mode 100644
index 00000000..ceac796a
--- /dev/null
+++ b/src/main/resources/lang/fr_fr.json
@@ -0,0 +1,115 @@
+{
+        "language": "Français",
+
+        "mapping_format.enigma_file": "Fichier Enigma",
+        "mapping_format.enigma_directory": "Répertoire Enigma",
+        "mapping_format.tiny_v2": "Tiny v2",
+        "mapping_format.tiny_file": "Fichier Tiny",
+        "mapping_format.srg_file": "Fichier SRG",
+        "mapping_format.proguard": "Proguard",
+        "type.methods": "Méthodes",
+        "type.fields": "Champs",
+        "type.parameters": "Paramètres",
+        "type.classes": "Classes",
+
+        "menu.file": "Fichier",
+        "menu.file.jar.open": "Ouvrir le jar...",
+        "menu.file.jar.close": "Fermer le jar",
+        "menu.file.mappings.open": "Ouvrir les mappings...",
+        "menu.file.mappings.save": "Enregistrer les mappings",
+        "menu.file.mappings.save_as": "Enregistrer les mappings sous...",
+        "menu.file.mappings.close": "Fermer les mappings",
+        "menu.file.mappings.drop": "Supprimer les mappings invalides",
+        "menu.file.export.source": "Exporter la source...",
+        "menu.file.export.jar": "Exporter le jar...",
+        "menu.file.stats": "Statistiques des mappings...",
+        "menu.file.stats.title": "Choisir les membres inclus",
+        "menu.file.stats.generate": "Générer les statistiques",
+        "menu.file.exit": "Quitter",
+        "menu.view": "Affichage",
+        "menu.view.themes": "Thèmes",
+        "menu.view.themes.default": "Par défaut",
+        "menu.view.themes.darcula": "Darcula",
+        "menu.view.themes.system": "Système",
+        "menu.view.themes.none": "Aucun (JVM par défaut)",
+        "menu.view.languages": "Langues",
+        "menu.view.languages.title": "Modifier la langue",
+        "menu.view.languages.summary": "La nouvelle langue sera appliquée lors du prochain redémarrage.",
+        "menu.view.languages.ok": "Ok",
+        "menu.view.search": "Rechercher",
+        "menu.help": "Aide",
+        "menu.help.about": "À propos",
+        "menu.help.about.title": "%s - À propos",
+        "menu.help.about.ok": "Ok",
+        "menu.help.github": "Page Github",
+
+        "popup_menu.rename": "Renommer",
+        "popup_menu.javadoc": "Éditer le Javadoc",
+        "popup_menu.inheritance": "Afficher l'héritage",
+        "popup_menu.implementations": "Afficher les implémentations",
+        "popup_menu.calls": "Afficher les appels",
+        "popup_menu.calls.specific": "Afficher les appels (spécifiques)",
+        "popup_menu.declaration": "Aller à la déclaration",
+        "popup_menu.back": "Annuler",
+        "popup_menu.forward": "Restaurer",
+        "popup_menu.mark_deobfuscated": "Marquer comme déobfusqué",
+        "popup_menu.reset_obfuscated": "Réinitialiser à obfusqué",
+
+        "info_panel.classes.obfuscated": "Classes obfusquées",
+        "info_panel.classes.deobfuscated": "Classes déobfusquées",
+        "info_panel.identifier": "Informations sur l'identifiant",
+        "info_panel.identifier.none": "Aucun identifiant sélectionné",
+        "info_panel.identifier.variable": "Variable",
+        "info_panel.identifier.field": "Champ",
+        "info_panel.identifier.method": "Méthode",
+        "info_panel.identifier.constructor": "Constructeur",
+        "info_panel.identifier.class": "Classe",
+        "info_panel.identifier.type_descriptor": "Descripteur de type",
+        "info_panel.identifier.method_descriptor": "Descripteur de méthode",
+        "info_panel.identifier.modifier": "Modificateur",
+        "info_panel.identifier.index": "Index",
+        "info_panel.editor.class.decompiling": "(décompilation...)",
+        "info_panel.editor.class.not_found": "Impossible de trouver la classe :",
+        "info_panel.tree.inheritance": "Héritage",
+        "info_panel.tree.implementations": "Implémentations",
+        "info_panel.tree.calls": "Graphique des appels",
+
+        "progress.operation": "%s - Opération en cours",
+        "progress.jar.indexing": "Indexation du jar",
+        "progress.jar.indexing.entries": "Entrées...",
+        "progress.jar.indexing.references": "Références des entrées...",
+        "progress.jar.indexing.methods": "Mise en place des méthodes...",
+        "progress.jar.indexing.process": "Traitement...",
+        "progress.jar.writing": "Écriture du jar...",
+        "progress.sources.writing": "Écriture des sources...",
+        "progress.classes.deobfuscating": "Déobfuscation des classes...",
+        "progress.classes.decompiling": "Décompilation des classes...",
+        "progress.mappings.enigma_file.loading": "Chargement du fichier de mappings",
+        "progress.mappings.enigma_file.done": "Terminé !",
+        "progress.mappings.enigma_file.writing": "Écriture des classes",
+        "progress.mappings.enigma_directory.loading": "Chargement des fichiers de mappings",
+        "progress.mappings.enigma_directory.writing": "Écriture des classes",
+        "progress.mappings.tiny_file.loading": "Chargement du fichier de mappings",
+        "progress.mappings.tiny_v2.loading": "Chargement du fichier de mappings",
+        "progress.mappings.srg_file.generating": "Génération des mappings",
+        "progress.mappings.srg_file.writing": "Écriture des mappings",
+        "progress.stats": "Génération des statistiques",
+        "progress.stats.data": "Génération des données",
+
+        "javadocs.edit": "Éditer les Javadocs",
+        "javadocs.instruction": "Éditer les Javadocs ici.",
+        "javadocs.cancel": "Annuler",
+        "javadocs.save": "Enregistrer",
+
+        "prompt.close.title": "Enregistrer les modifications ?",
+        "prompt.close.summary": "Vos mappings n'ont pas encore été enregistrés. Souhaitez-vous enregistrer ?",
+        "prompt.close.save": "Enregistrer et fermer",
+        "prompt.close.discard": "Annuler les modifications",
+        "prompt.close.cancel": "Annuler",
+
+        "crash.title": "%s - Rapport de plantage",
+        "crash.summary": "%s a planté ! =(",
+        "crash.ignore": "Ignorer",
+        "crash.exit": "Quitter",
+        "crash.exit.warning": "Si vous choisissez Quitter, vous perdrez tout travail non sauvegardé."
+}