This website is realized with DokuWiki, which is used for content management and allows some form of collaboration.
There are three groups of users with different rights:
Space-week.de is about the german activities during Space week 2010, so naturally most of the pages are in german.
Some texts have been translated to english though - existance of an english page is indicated by the blue |en| link in the lower right, otherwise it is grey. Clicking on this link switches to the english page, and from there |de| goes the other direction.
The [Index] button on the lower right gives an overview of all pages, english ones are grouped under the 'en' branch.