Last modified: 2014-02-20 21:06:35 UTC
$rightsWarningMessage = wfMessage( 'wikibase-shortcopyrightwarning', wfMessage( 'wikibase-save' )->inContentLanguage()->text(), wfMessage( 'copyrightpage' )->inContentLanguage()->text(), "[$wgRightsUrl $wgRightsText]" )->parse(); On item creation page wikibase-newentity-submit is used instead of wikibase-save, and not inContentLanguage.
CopyrightMessageBuilder is currently forced to use the [[w:d:MediaWiki:wikibase-save]] message. This needs refactoring. The problem with the wrong language seems to be fixed already.