[[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.
Version: unspecified
Severity: normal