public function actionContact()
 {
     $model = new ContactForm();
     if ($model->load(Yii::$app->request->post()) && $model->validate()) {
         if ($model->sendEmail(Yii::$app->params['adminEmail'])) {
             Yii::$app->session->setFlash('success', yii::t('adminlte', 'Thank you for contacting us. We will respond to you as soon as possible.'));
         } else {
             Yii::$app->session->setFlash('error', yii::t('adminlte', 'There was an error sending email.'));
         }
         return $this->refresh();
     } else {
         return $this->render('contact', ['model' => $model]);
     }
 }