DmitryDulepov\Realurl\Encoder\UrlEncoder::setLanguage PHP Method

    protected function setLanguage()
    {
        if (isset($this->urlParameters['L']) && MathUtility::canBeInterpretedAsInteger($this->urlParameters['L'])) {
            $this->sysLanguageUid = (int) $this->urlParameters['L'];
        } else {
            $this->sysLanguageUid = (int) $this->tsfe->sys_language_uid;
        }
    }