If your Diazo theme was created as a Python package using mr.bob or zopeskel, you probably already have one z3c.jbot, which makes it easy to override the available templates. If so, you probably have a directory template_overridesor similar directory in the package. If so, just paste the file with the name plone.app.layout.viewlets.footer.ptwith the contents into it:
<div i18n:domain="plone"
id="portal-footer">
<ul id="portal-doormat"
class="navTreeLevel0 visualNoMarker">
<tal:sitemap replace="structure context/@@sitemap/createSiteMap" />
</ul>
</div>
Then wear off!
Alternatively, you can replace colophon by naming the file plone.app.layout.viewlets.colophon.pt.
Python ( Diazo ), portal_view_customizations ZMI, .
. portal_properties, navtree_properties. CSS, .