RainLab\Translate\Models\Message::trans PHP Method

    public static function trans($messageId, $params = [])
    {
        $msg = static::get($messageId);
        $params = array_build($params, function ($key, $value) {
            return [':' . $key, $value];
        });
        $msg = strtr($msg, $params);
        return $msg;
    }

 public function translateString($string, $params = [])
 {
     return Message::trans($string, $params);
 }