[third] Integrate i18next with Handlebars

static/js/src/main.js

@@ -1 +1,26 @@
 // commonjs code goes here
+
+var i18n = window.i18n = require('i18next');
+var XHR = require('i18next-xhr-backend');
+var lngDetector = require('i18next-browser-languagedetector');
+var backendOptions = {
+    loadPath: '/static/locale/__lng__/__ns__.json'
+};
+
+var detectionOptions = {
+    order: ['htmlTag'],
+    htmlTag: document.documentElement
+};
+
+i18n.use(XHR)
+    .use(lngDetector)
+    .init({
+        nsSeparator: false,
+        keySeparator: false,
+        interpolation: {
+            prefix: "__",
+            suffix: "__"
+        },
+        backend: backendOptions,
+        detection: detectionOptions
+});