message: remove authentication entry from window menu
diff: <span class="jsxc-more"></span>
  <div class="jsxc-inner">
  <ul>
  - <li>
  - <a class="jsxc-verification" href="#">
  - <span>{{t "Authentication"}}</span>
  - </a>
  - </li>
  <li>
  <a class="jsxc-clear" href="#">
  <span>{{t "clear_history"}}</span>
  <span>{{t "Send_file"}}</span>
  </a>
  </li>
  - <!-- <li>
  - <a class="jsxc-share-screen" href="#">
  - <span>{{t "Share_screen"}}</span>
  - </a>
  - </li> -->
  </ul>
  </div>
  </div>
  