[Mediawiki-l] how to change site license remainder?

[aretai aretai]

Hi,

Maybe someone know how to change the notice (copyright, license, etc) that
appears when you try to edit a page? In case of mediawiki.org it's sth like:
  *Have you checked the site license? If not, read this before posting!*

MediaWiki.org uses two site licenses:

   - Pages in the *Help:* namespace all have a *thick blue border* around
   them, indicating that their content is released into the public
domain<http://en.wikipedia.org/wiki/public_domain>.
   Do not make edits to these pages unless you are comfortable releasing your
   contributions in this way.
   - Contributions to all other pages are considered to be released under
   the GNU Free Documentation License.

See Project:Copyrights
<http://www.mediawiki.org/wiki/Project:Copyrights>for full details
about the licenses used on this site.

If you don't want your writing to be edited mercilessly and redistributed at
will, then don't submit it here.
You are also promising us that you wrote this yourself, or copied it from a
public domain or similar free resource. *DO NOT SUBMIT COPYRIGHTED WORK
WITHOUT PERMISSION!*

Regards,

Aretai