bugzilla-4intranet/extensions/BmpConvert/template/en/default/hook/global/messages-messages.html.tmpl

[% IF message_tag == 'attachment_convertedbmp' %]
<dl><dd><p>
  <b>Note:</b> [% terms.Bugzilla %] automatically converted your BMP image file to a
  compressed PNG format.
</p></dd></dl>
[% END %]