Last modified: 2012-04-16 09:15:57 UTC
[[MediaWiki:Recentchanges-summary]] was added in r86186. Now the text is shown [[Special:RecentChanges]] due to LocalizationUpdate. AFAIK all [[MediaWiki:specialpagename-summary]] exist on default. Examples: http://cs.wikipedia.org/wiki/Speci%C3%A1ln%C3%AD:Posledn%C3%AD_zm%C4%9Bny?uselang=cs which looks weird.
I reverted the relevant revisions, deleted the $IP/cache/l10n directory and rebuilt it, that seems to have fixed the problem.