Translatewiki (.net) is a wiki for doing translations and will be the site where Consumium is translated.
Special:Translate done by mw:Extensions:Translate with mw:User:Nikerabbit et. al. in the controlls so expect nothing but great stuff from this effort .The extension also implements an mw:API and mw:locale ( ! )
The clean changes extension which ( text below from mw:Extension:CleanChanges under GFDL ):
notice by language code suffix
See this URL shows RecentChanges of articles ending in '/fi'] This is done with MediaWiki/extensions#CleanChanges so Translatewiki is proof that multilingual data entry into a wiki can work. Their approach is very EPOVy but I think this can be tolerated to achieve many languages in one wiki like Translatewiki and Wikimedia.org, MediaWiki.org etc.
http://translatewiki.net/wiki/Special:Version lists all extensions used there. Especially interesting is Universal LanguageSelector ( which as of 2012-07-02 has not been released yet )