message: added icon as key
diff: <li role="separator" class="divider"></li>
  <li ng-repeat="language in languages" style="cursor:pointer">
  <a ng-click="changeLanguage(language.key)">
  - <span class="flag-icon flag-icon-{{language.key.slice(-2).toLowerCase()}}"></span>
  + <span class="flag-icon flag-icon-{{language.icon}}"></span>
  {{language.lang}} <i ng-if="language.isFlask" class="fas fa-flask"></i>
  </a>
  </li>
  