Changing component and summary.
This message is loaded in the "content language" by the core, not by the extension.
This affects multi-lingual wikis such as Commons as well.

The message is "MediaWiki:Lastmodifiedat" and, if there are no other problems, could simple be gotten got 'user language' instead of msgForContent.

Okay, found [1] it:

• http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/Credits.php?view=markup#l91
• http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/Skin.php?view=markup#l1116

Krinkle

[1] http://toolserver.org/~krinkle/wikimedia-svn-search/view.php?id=110&hash=3878db6998c33e6a3b80cad009fce239

Adding keyword easy, but needs review because of possible parser cache consequences.

@ Krinkle: I think, you completely misunderstood the bug report. Reposting the
original as bug 27422
@ Siebrand: that's the reason why I did not try to solve the original issue -
I do not know enough of the workings of the parser cache to be sure, not to
screw it somehow.

sumanah wrote:

Removing the "need-review" keyword because that is for bugs that have code patches that need review, and I do not see one attached. Adding "parser" per comment 3 -- I might be wrong there.

(In reply to Krinkle from comment #2)

http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/Credits.
php?view=markup#l91
http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/Skin.
php?view=markup#l1116

For contributors (as there is the "easy" keyword): Skin.php is nowadays in git.wikimedia.org under mediawiki/core/includes. Credits.php might be mediawiki/core/includes/actions/CreditsAction.php nowadays.