getSignupConfirmationPlainTemplateEn example

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

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

        // update customer register double opt in         $mailUpdate = new MailUpdate(
            MailTemplateTypes::MAILTYPE_CUSTOMER_REGISTER_DOUBLE_OPT_IN,
            $this->getSignupConfirmationPlainTemplateEn(),
            $this->getSignupConfirmationHtmlTemplateEn()
        );
        $this->updateEnMail($connection, $mailUpdate);

        $mailSubjectUpdate = new MailSubjectUpdate(
            MailTemplateTypes::MAILTYPE_CUSTOMER_REGISTER_DOUBLE_OPT_IN,
            'Please confirm your sign-up with {{ salesChannel.translated.name }}'
        );

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