message: style(GUI): change WarningModal title to "Attention"
  See:
diff: <div class="modal-header">
  <h4 class="modal-title">
  <span class="glyphicon glyphicon-exclamation-sign"></span>
  - <span>Warning!</span>
  + <span>Attention</span>
  </h4>
  <button class="close" ng-click="modal.reject()">&times;</button>
  </div>
  