lib/modules/Register/styles/register-mail.tpl
<td colspan="2">
<h1>{-"Thanks for your registration!"|translate}</h1>
<p>Hi {-$name},
<p>
<p>{-"Please verify you email by clicking this link:"|translate}</p>
{-assign var="verifyUrl" value="index.php?m=register&action=verify&x={-$registerSalt}"}
<a href="{-$verifyUrl|URL}">Verify Your Account now!</a>
</td>