There are 5 folders, each containing a separate static website. The "german2014" folder contains Thomas Clausen's translation. The other 4 folders contain translations from 2012 and I don't know who made them.
Hopefully these translations will be useful. However, they shouldn't be used to represent Giving What We Can (for example by just re-hosting the sites unmodified) without first checking with a Giving What We Can member of staff.