Cache translations.

Fixes: #1158

package.json

@@ -19,7 +19,8 @@
     "i18next": "3.0.0",
     "i18next-parser": "0.7.0",
     "i18next-xhr-backend": "0.5.4",
-    "i18next-browser-languagedetector": "0.3.0"
+    "i18next-browser-languagedetector": "0.3.0",
+    "i18next-localstorage-cache": "0.3.0"
   },
   "scripts": {},
   "repository": {

static/js/src/main.js

@@ -4,6 +4,8 @@
     var i18n = window.i18n = require('i18next');
     var XHR = require('i18next-xhr-backend');
     var lngDetector = require('i18next-browser-languagedetector');
+    var Cache = require('i18next-localstorage-cache');
+
     var backendOptions = {
         loadPath: '/static/locale/__lng__/translations.json'
     };
@@ -15,8 +17,14 @@
         htmlTag: document.documentElement
     };
 
+    var cacheOptions = {
+        enabled: true,
+        prefix: page_params.server_generation + ':'
+    };
+
     i18n.use(XHR)
         .use(lngDetector)
+        .use(Cache)
         .init({
             nsSeparator: false,
             keySeparator: false,
@@ -25,7 +33,8 @@
                 suffix: "__"
             },
             backend: backendOptions,
-            detection: detectionOptions
+            detection: detectionOptions,
+            cache: cacheOptions
         }, function () {
             var i;
             initialized = true;

zerver/tests/tests.py

@@ -1799,6 +1799,7 @@ class HomeTest(AuthedTestCase):
             "realm_restricted_to_domain",
             "referrals",
             "save_stacktraces",
+            "server_generation",
             "share_the_love",
             "show_digest_email",
             "sounds_enabled",

zerver/views/__init__.py

@@ -931,6 +931,7 @@ def home(request):
         poll_timeout          = settings.POLL_TIMEOUT,
         login_page            = settings.HOME_NOT_LOGGED_IN,
         maxfilesize           = settings.MAX_FILE_UPLOAD_SIZE,
+        server_generation     = settings.SERVER_GENERATION,
         password_auth_enabled = password_auth_enabled(user_profile.realm),
         have_initial_messages = user_has_messages,
         subbed_info           = register_ret['subscriptions'],