plugins/sys/templates/admin/revisions_manager/preview_obj_item.stpl
<h2>{t(Preview of)} "<em>{object_name} -- {object_id}</em>"</h2>
<div>
<div class="column">
<div class="title">Old</div>
<div class="example_container">
{old_text}
</div>
</div>
<div class="column">
<div class="title">New</div>
<div class="example_container">
{new_text}
</div>
</div>
</div>
<br style="clear:both;" />
<br />
<div align="center"><a href="{back_url}">{t(Back)}</a></div>