Wikimedia Bugzilla is closed!

It would be courteous towards the foreign language users (who e.g. want to
create an account for interwiki-interlanguage linking) if the login page allowed
them to select a different interface language. 

Current siutation is not really bad:
1. You can always do this attaching "uselang=..." to the login URL (yet not
everybody might be aware of it or memorize his or her tongues language code)
2. Once you have an account, you can set your preferred interface language in
user prefences (but have to navigate there in the default language, if you do
not know 1.)
3. Admins can configure the login page as e.g. in
http://ksh.wikipedia.org/wiki/Special:Userlogin, source at:
http://ksh.wikipedia.org/w/index.php?title=MediaWiki:Loginend&action=edit (yet
hardly anyone did that at present)

Adding the language selection into MediaWiki software offers some enhancements:
4. an always up-to-date language list is presented,
5. the language selected during account creation can be automatically saved in
the user preferences,
6. unburdens local wiki admins,
7. more equal appearance, when interface language has been switched,
8. reduced server load, better cacheablity.

Also:
9. On the long run, interface language switching can be incorporated as a
navigational element into the standard frame of each page. Useful specifically
for true multilingual wikies, such as
[http://meta.wikimedia.org/wiki/WiktionaryZ] et al.