(In reply to comment #0)

Making configuration of their wikis easier for operators, and allow them
quickly testing modifications, please move various things to the namespace
MediaWiki, which are currently not in it:

Skin names:
(a mapping would do: "Modern:Nieuwe mode; Monobook:Enkel Book; ..." in a
single message)

Yes they are. See 'MediaWiki:skinname-monobook' or any of the others.

Namespagenames:
(a mapping would do again in a single message)

Alternate namespacenames
(a mapping would do, it could even be in 1 message with normal names:
"Talk:Oeverleg:Dikutie:Gesprek; User:Bruker:Bruiker:Broeker:Meidoger; ..." or
"0::Aartikel; 1:Oeverleg:Dikutie; 2:Bruker: ...")

Bad idea. Changing Namespaces requires running namespaceDupes and should not be done via the UI. This needs to remain a LocalSettings change.

I dunno about the other two ideas (linktrail and redirect logo, etc.).

Most of this (including special page names and namespace aliases) can be localized using http://translatewiki.net/wiki/Special:AdvancedTranslate tool.

Well many other things are specified in the Template: namespace which spun off
from MediaWiki: namespace long time ago.

Toolbar icons are in the MediaWiki namespace, please see

http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/EditPage.php?view=markup&pathrev=82734#l2282

for their names.