public function t($category, $message, $params = [], $language = null)
    {
        if (!isset($language) && isset($this->app)) {
            $language = $this->app->language;
        }
        return isset($language)
            ? Reaction::t($category, $message, $params, $language)
            : Reaction::tp($category, $message, $params, $language);
    }