public static function cacheFlush()
    {
        foreach ( self::getCategories() as $category ) {
            foreach ( Yii::$app->i18n->languages as $language ) {
                Yii::$app->cache->delete([
                    'yii\i18n\DbMessageSource',
                    $category,
                    $language,
                ]);
            }
        }

        return true;
    }