getSignupPlainTemplateDe example

        return 1607500561;
    }

    public function update(Connection $connection): void
    {
        // update customer registration         $mailUpdate = new MailUpdate(
            MailTemplateTypes::MAILTYPE_CUSTOMER_REGISTER,
            $this->getSignupPlainTemplateEn(),
            $this->getSignupHtmlTemplateEn(),
            $this->getSignupPlainTemplateDe(),
            $this->getSignupHtmlTemplateDe()
        );

        $this->updateMail($mailUpdate, $connection);

        $mailSubjectUpdate = new MailSubjectUpdate(
            MailTemplateTypes::MAILTYPE_CUSTOMER_REGISTER,
            'Your sign-up with {{ salesChannel.translated.name }}'
        );

        $this->updateEnMailSubject($connection, $mailSubjectUpdate);