/**
  * Activate didactic templates
  * @global ilErrorHandling $ilErr
  * @global ilCtrl $ilCtrl
  * @return void
  */
 protected function deactivateTemplates()
 {
     global $ilErr, $ilCtrl;
     if (!$_REQUEST['tpls']) {
         ilUtil::sendFailure($this->lng->txt('select_one'));
         return $ilCtrl->redirect($this, 'overview');
     }
     foreach ($_REQUEST['tpls'] as $tplid) {
         $tpl = new ilDidacticTemplateSetting($tplid);
         $tpl->enable(false);
         $tpl->update();
     }
     ilUtil::sendSuccess($this->lng->txt('didactic_deactivated_msg'), true);
     $ilCtrl->redirect($this, 'overview');
 }