Thread:Project:Current issues/insert "Vorlage" into a new mediawiki

i want to install a new wiki for my company and i found a nice "Vorlage" (Template) -> [].

when i create the sides every think looks like wikipedia - but the collapse-event will not work and the link "Ausklappen" / "Einklappen" will not show.

did i insert some special css or ...?

regards Jan