Fix language selection in sandboxed iframes

www/common/cryptpad-common.js

@@ -184,6 +184,9 @@ define([
         }
         return;
     };
+    common.getLanguage = function () {
+        return Messages._languageUsed;
+    };
     common.getUserlist = function () {
         if (store) {
             if (store.getProxy() && store.getProxy().info) {

www/common/migrate-user-object.js

@@ -77,5 +77,19 @@ define([], function () {
             Cryptpad.feedback('Migrate-2', true);
             userObject.version = version = 2;
         }
+
+
+
+        // Migration 3: language from localStorage to settings
+        var migrateLanguage = function () {
+            if (!localStorage.CRYPTPAD_LANG) { return; }
+            var l = localStorage.CRYPTPAD_LANG;
+            userObject.settings.language = l;
+        };
+        if (version < 3) {
+            migrateLanguage();
+            Cryptpad.feedback('Migrate-3', true);
+            userObject.version = version = 3;
+        }
     };
 });

www/common/sframe-boot.js

@@ -42,6 +42,7 @@ var afterLoaded = function (req) {
             updated: updated,
             cache: data.cache
         };
+        window.cryptpadLanguage = data.language;
         require(['/common/sframe-boot2.js'], function () { });
     };
     window.addEventListener('message', onReply);

www/common/sframe-common-outer.js

@@ -51,7 +51,7 @@ define([
 
                 SFrameChannel.create($('#sbox-iframe')[0].contentWindow, waitFor(function (sfc) {
                     sframeChan = sfc;
-                }), false, { cache: cache });
+                }), false, { cache: cache, language: Cryptpad.getLanguage() });
                 Cryptpad.ready(waitFor());
             }));
         }).nThen(function (waitFor) {