<div class="text-center">
  <span translate>Background layer:</span>&nbsp;
  <div class="dropdown">
    <button type="button" class="btn btn-default" data-toggle="dropdown">
      {{ctrl.bgLayer.get('label')|translate}} <span class="caret"></span>
    </button>
    <ul class="dropdown-menu" role="menu">
      <li ng-repeat="layer in ::ctrl.bgLayers">
        <a href ng-click="ctrl.setLayer(layer)">{{::layer.get('label')|translate}}</a>
      </li>
    </ul>
  </div>
</div>

<div class="text-center">
  <span translate>Background layer:</span>&nbsp;
  <div class="dropdown">
    <button type="button" class="btn btn-default" data-toggle="dropdown">
      {{ctrl.bgLayer.get('label')|translate}} <span class="caret"></span>
    </button>
    <ul class="dropdown-menu" role="menu">
      <li ng-repeat="layer in ::ctrl.bgLayers">
        <a href ng-click="ctrl.setLayer(layer)">{{layer.get('label')|translate}}</a>
      </li>
    </ul>
  </div>
</div>

Update background layer labels when switching lang
Update background layer labels when switching lang
