plugins/sys/templates/admin/admin_messages/view_msg.stpl
<h2>{t(Admin Message for user)}: <a href="{account_link}" target="_blank"><b>{user_name}</b></a></h2>
<br />
<div>
<p>
<label><small><b>{t(Title)}</b>: </small></label><br />
{title}
</p>
<p>
<label><small><b>{t(Text)}</b>: </small></label><br />
{text}
</p>
</div>