pass translations to frontend as a json object

js/App.js

@@ -17,6 +17,15 @@ const App = {
    hotkey_actions: {},
    is_prefs: false,
    LABEL_BASE_INDEX: -1024,
+   _translations: {},
+   l10n: {
+      ngettext: function(msg1, msg2, n) {
+         return self.__((parseInt(n) > 1) ? msg2 : msg1);
+      },
+      __: function(msg) {
+         return App._translations[msg] ? App._translations[msg] : msg;
+      }
+   },
    FormFields: {
       attributes_to_string: function(attributes) {
          return Object.keys(attributes).map((k) =>
@@ -525,6 +534,13 @@ const App = {
 				PluginHost.run(PluginHost.HOOK_PARAMS_LOADED, this._initParams);
 		}
 
+      const translations = reply['translations'];
+
+      if (translations) {
+         console.log('reading translations...');
+         App._translations = translations;
+      }
+
 		this.initSecondStage();
 	},
 	Error: {

js/common.js

@@ -1,8 +1,22 @@
 'use strict';
 
-/* global dijit, __, App, dojo, __csrf_token */
+/* global dijit, App, dojo, __csrf_token */
 /* eslint-disable no-new */
 
+/* exported __ */
+function __(msg) {
+	if (typeof App != "undefined") {
+		return App.l10n.__(msg);
+	} else {
+		return msg;
+	}
+}
+
+/* exported ngettext */
+function ngettext(msg1, msg2, n) {
+	return __((parseInt(n) > 1) ? msg2 : msg1);
+}
+
 /* exported $ */
 function $(id) {
 	console.warn("FIXME: please use App.byId() or document.getElementById() instead of $():", id);