private function generateAdditionalInformations($additionalInformationsId)
    {
        $additionalInformations = null;

        if (!empty($additionalInformationsId) && !in_array($additionalInformationsId, $this->additionalInformationsExcluded)) {
            $additionalInformations = $this->translator->trans(
                'calendar.schedules.additional_informations.' . $additionalInformationsId,
                array(),
                'messages'
            );
        }

        return $additionalInformations;
    }