message: Add no-javascript help text.
diff: </head>
  <body>
  - <app></app>
  + <app>
  + DIM hasn't loaded. Something may be wrong with it, or with your browser (maybe you have a content blocker, or have disabled JavaScript). Try force reloading to make sure (Ctrl-F5 or Cmd-R).
  + </app>
  <div id="browser-warning" class="hidden">Your browser is not supported by DIM. Some or all DIM functionality may not work. Please upgrade to a supported browser.</div>
  <script async src="https://www.google-analytics.com/analytics.js"></script>
  