plugins/sys/templates/user/account/change_email/email_exists.stpl
<h1 class="header">Email Change Error</h1>
<table width="100%" align="center">
<tr>
<td><p>Sorry, it seems that user with this email address already exists!
Use <a href="./?object=get_pswd">password reminder</a> to retrieve the password for this account.
</p>
</td>
</tr>
</table>