Update translation. Removed old files

src/js/controllers/preferencesLanguage.js

@@ -0,0 +1,23 @@
+'use strict';
+
+angular.module('copayApp.controllers').controller('preferencesLanguageController',
+  function($scope, $timeout, configService, applicationService) {
+
+    this.save = function(newLang) {
+      var opts = {
+        wallet: {
+          settings: {
+            defaultLanguage: newLang
+          }
+        }
+      };
+
+      this.loading = true;
+      $timeout(function() {
+        configService.set(opts, function(err) {
+          if (err) console.log(err);
+          applicationService.restart();
+        });
+      }, 100);
+    };
+  });