/**
  * deletes activity element
  * @param $id
  * @param $element
  */
 public function deleteElement($id, $element)
 {
     $activity = $this->activityManager->getActivityData($id);
     if (Gate::denies('ownership', $activity)) {
         return redirect()->back()->withResponse($this->getNoPrivilegesMessage());
     }
     $result = $this->activityManager->deleteElement($activity, $element);
     if ($result) {
         $this->activityManager->resetActivityWorkflow($id);
         $response = ['type' => 'success', 'code' => ['activity_element_removed', ['element' => 'activity']]];
     } else {
         $response = ['type' => 'danger', 'code' => ['activity_element_not_removed', ['element' => 'activity']]];
     }
     return redirect()->back()->withResponse($response);
 }