code: public function attributeLabels() {
  
  		return [
  			'newsletterId' => Yii::$app->newsletterMessage->getMessage( NewsletterGlobal::FIELD_NEWSLETTER ),
  			'name' => Yii::$app->coreMessage->getMessage( CoreGlobal::FIELD_NAME ),
  			'email' => Yii::$app->coreMessage->getMessage( CoreGlobal::FIELD_EMAIL )
  		];
  	}
docs: yii\base\Model ---------