Forum:Chaging namespace tab text

I was looking at the Wikia custom skins page, and noticed Muumitaalo's (I don't know how to spell) etusivu tab in stead of the regular sivu. I checked the .js, and the code was... confusing. It didn't say etusivu (as a page) anywhere, but lots of mainPage stuff existed. So I wonder, how do I change this on other pages, and in whole namespaces? – Smiddle 21:07, 4 February 2007 (UTC)

P.S., Desciclopédia has a similar thing. Every forum page has "topico/fórum" instead of forum.