yii\i18n\MessageSource::translateMessage PHP Метод

    protected function translateMessage($category, $message, $language)
    {
        $key = $language . '/' . $category;
        if (!isset($this->_messages[$key])) {
            $this->_messages[$key] = $this->loadMessages($category, $language);
        }
        if (isset($this->_messages[$key][$message]) && $this->_messages[$key][$message] !== '') {
            return $this->_messages[$key][$message];
        } elseif ($this->hasEventHandlers(self::EVENT_MISSING_TRANSLATION)) {
            $event = new MissingTranslationEvent(['category' => $category, 'message' => $message, 'language' => $language]);
            $this->trigger(self::EVENT_MISSING_TRANSLATION, $event);
            if ($event->translatedMessage !== null) {
                return $this->_messages[$key][$message] = $event->translatedMessage;
            }
        }
        return $this->_messages[$key][$message] = false;
    }