[Koha] Translating KOHA

I'm currently setting up KOHA for the centre for further training at my university and for the staff to be able to feed the database, I have to translate at least parts of the interface to German. What is the recommended way to translate KOHA? Are there any "tools" available? In the mailing list archive I read about a previous effort to translate KOHA to German, but I couldn't find any related packages. Has it been cancelled? -- Christian Hennecke