/**
  * Finds the Message model based on its primary key value.
  * If the model is not found, a 404 HTTP exception will be thrown.
  * @param integer $id
  * @param string $language
  * @return Message the loaded model
  * @throws NotFoundHttpException if the model cannot be found
  */
 protected function findModel($id, $language)
 {
     if (($model = Message::findOne(['id' => $id, 'language' => $language])) !== null) {
         return $model;
     } else {
         throw new NotFoundHttpException('The requested page does not exist.');
     }
 }