use static loader

angular_app/index.html

@@ -13,6 +13,7 @@
         <script src="/static/js/angular-ui-router.min.js"></script>
         <script src="/static/js/angular-websocket.js"></script>
         <script src="/static/js/angular-translate.js"></script>
+        <script src="/static/js/angular-translate-loader-static-files.min.js"></script>
         <script src="/static/js/eventman.js"></script>
         <script src="/js/app.js"></script>
         <script src="/js/i18n.js"></script>