MattisManzel:
Surprise, surprise: There is a parallel event: de.wikipedia: Project P I offered our collaboration.
xtof, the idea to put the categories in the sidebar is good. You tried out putting CategoryFrench there and I see the intention. It is a different situation here than on community-wiki: multilingual experiment. There it was slowly developing multilingual work on the page-level. Here on the contrary we have fast development of an online-event and going in differeis languages on the category-level is the way to go. No doubt it will lead to confusions but the translation-team will cope with the task, I hope. It is doubtlessly the way to reach mass-participation. wiki-Woodstock wants mass-participation. I would opt for starting WikiForumFrench? and WikiForumGerman?. The working-language of this wiki is English. But we do not exclude non-English speakers.