If you mean the footer in the sitemaps themselves then you can edit these yourself.
The site map pages layout can be modified to suit to your website in pages/mods/sitemap_tpl.html file. 
Besides modifying the stylesheet for html sitemap, you can change the way it is formatted. The basic template commands are: 
<TLOOP XX>...</TLOOP> - defines a repeating sequence of code (like page numbers or sitemap links) 
<TIF XX>...</TIF> - defines a conditional statement that is inserted only when a specific term is met 
<TVAR XX> - inserts a value of a specified variable 
Please refer to sitemap_tpl.html file for usage example.