1movedto2 and 1movedto2_redir
Fragment of a discussion from Translating talk:MediaWiki
I still don't understand why the default messages from translatewiki.net, which were localised and exported to cyWP ages ago, have now disappeared from the cy messages file in MediaWiki (the default message in cyWP is now in English again). This appears to have happened to all languages, not just cy.