accounts/common/emails/views/new-email-confirmation-text.php

<?php
/**
 * @var string $username
 * @var string $key
 */
?>

This E-mail was specified as new for account <?= $username ?>. To confirm this E-mail, pass code below into form on site.

Code: <?= $key ?>

// P.S. yes, this is E-mail is not designed yet :)