add page for listing missing translations

www/assert/translations/index.html

@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta content="text/html; charset=utf-8" http-equiv="content-type"/>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+    <script data-main="main" src="/bower_components/requirejs/require.js"></script>
+</head>
+<body>
+
+