Bootstrap.php
protected function initLanguages()
    {
        if (!Yii::$app->user->isGuest) {
            Yii::$app->language = Yii::$app->user->identity->lang;
        }

        if (!isset(Yii::$app->wavecms))
            throw new InvalidConfigException(Yii::t('wavecms/main', 'Component "wavecms" not defined in config.php'));

        if (!count(Yii::$app->wavecms->languages))
            throw new InvalidConfigException(Yii::t('wavecms/main', 'Property "languages" is not defined in config file for component "wavecms"'));

        if (!Yii::$app->session->get('editedLanguage')) {
            Yii::$app->session->set('editedLanguage', Yii::$app->wavecms->languages[0]);
        }

        Yii::$app->wavecms->editedLanguage = Yii::$app->session->get('editedLanguage');
    }
protected function initLanguages()
    {
        if (!Yii::$app->user->isGuest) {
            Yii::$app->language = Yii::$app->user->identity->lang;
        }

        if (!isset(Yii::$app->wavecms))
            throw new InvalidConfigException(Yii::t('wavecms/main', 'Component "wavecms" not defined in config.php'));

        if (!count(Yii::$app->wavecms->languages))
            throw new InvalidConfigException(Yii::t('wavecms/main', 'Property "languages" is not defined in config file for component "wavecms"'));

        if (!Yii::$app->session->get('editedLanguage')) {
            Yii::$app->session->set('editedLanguage', Yii::$app->wavecms->languages[0]);
        }

        Yii::$app->wavecms->editedLanguage = Yii::$app->session->get('editedLanguage');
    }
Init wavecms languages
@param $module
@throws \yii\base\InvalidConfigException