Messenger.php

<?php

namespace nanson\messenger;

use Yii;
use yii\base\Module;

/**
 * Class Messenger
 * @package nanson\messenger
 * @author Chernyavsky Denis <panopticum87@gmail.com>
 */
class Messenger extends Module
{

    const MODULE = 'messenger';

    /**
     * @var string User class
     */
    public $userClass;

    /**
     * @inheritdoc
     */
    public function init()
    {
        if (is_null($this->userClass)) {
            $this->userClass = Yii::$app->user->identityClass;
        }

        $this->registerTranslations();

        return parent::init();
    }

    public function registerTranslations()
    {
        Yii::$app->i18n->translations['messenger/*'] = [
            'class' => 'yii\i18n\PhpMessageSource',
            'sourceLanguage' => 'en-US',
            'basePath' => '@vendor/nanson/yii2-messenger/messages',
            'fileMap' => [
                'messenger/app' => 'app.php',
            ],
        ];
    }

}