Piwik\Plugins\Transitions\Controller::getTranslation PHP Method

    public static function getTranslation($key)
    {
        return Piwik::translate(self::$metricTranslations[$key]);
    }

 private function getReferrerLabel($referrerId)
 {
     switch ($referrerId) {
         case Common::REFERRER_TYPE_DIRECT_ENTRY:
             return Controller::getTranslation('directEntries');
         case Common::REFERRER_TYPE_SEARCH_ENGINE:
             return Controller::getTranslation('fromSearchEngines');
         case Common::REFERRER_TYPE_WEBSITE:
             return Controller::getTranslation('fromWebsites');
         case Common::REFERRER_TYPE_CAMPAIGN:
             return Controller::getTranslation('fromCampaigns');
         default:
             return Piwik::translate('General_Others');
     }
 }