plugins/sys/templates/user/account/change_email/send_success.stpl
<h1 class="header">Email change confirmation required</h1>
<table width="100%" align="center">
<tr>
<td>In order to protect the system from abuse we require this action to be confirmed.
We sent an e-mail with a link to confirm your email change.
Please check your new mailbox in a couple of minutes.
</td>
</tr>
</table>