diff --git a/SketchI18N.sketchplugin/Contents/Sketch/app.js b/SketchI18N.sketchplugin/Contents/Sketch/app.js
index f068354..00a991e 100644
--- a/SketchI18N.sketchplugin/Contents/Sketch/app.js
+++ b/SketchI18N.sketchplugin/Contents/Sketch/app.js
@@ -1,27 +1,39 @@
 var onRun = function(context) {
     var manager,
+        languagePath,
         doc = context.document,
         command = context.command,
         identifier = command.identifier(),
         resourcesPath = command.pluginBundle().url().path(),
-        language = NSUserDefaults.standardUserDefaults().objectForKey("AppleLanguages").objectAtIndex(0),
+        language = NSUserDefaults.standardUserDefaults().objectForKey("AppleLanguages").objectAtIndex(0);
+
+    for(;;){
         languagePath = resourcesPath + "/Contents/Resources/i18n/" + language + ".json";
+        if (NSFileManager.defaultManager().fileExistsAtPath(languagePath)) {
+            break;
+        }
+        else {
+            var index = language.lastIndexOf("-");
+            if (index == -1) {
+                return;
+            }
+            language = language.substring(0, index);
+        }
+    }
 
-    if (NSFileManager.defaultManager().fileExistsAtPath(languagePath)) {
+    if (!NSClassFromString("SketchI18NPluginManager")) {
         var mocha = Mocha.sharedRuntime();
-        i18n = [NSString stringWithContentsOfFile: languagePath encoding: NSUTF8StringEncoding error: nil];
+        mocha.loadFrameworkWithName_inDirectory("SketchI18NPlugin", resourcesPath + "/Contents/Resources");
+        manager = SketchI18NPluginManager.manager();
+        var i18n = NSString.stringWithContentsOfFile_encoding_error(languagePath, NSUTF8StringEncoding, nil);
+        manager.loadStrings(i18n);
+    } else {
+        manager = SketchI18NPluginManager.manager();
+    }
 
-        if (!NSClassFromString("SketchI18NPluginManager")) {
-            mocha.loadFrameworkWithName_inDirectory("SketchI18NPlugin", resourcesPath + "/Contents/Resources");
-            manager = SketchI18NPluginManager.manager();
-            manager.loadStrings(i18n);
-        } else {
-            manager = SketchI18NPluginManager.manager();
-        }
-        if (identifier == "i18n-toggle-command") {
-            manager.toggle();
-        } else {
-            manager.run();
-        }
+    if (identifier == "i18n-toggle-command") {
+        manager.toggle();
+    } else {
+        manager.run();
     }
 }