I noticed you are looking for translators... well, I'd offer to give a try and translate IMSLP to German. I purposely say 'to give a try' because I'm not sure if I am really qualified to do this, as I am not very skilled with coding wikis (lack of experience)... but with some help I'm convident it will work out fine
Of course I only request this if there is nobody else doing it already...
best regards,
Karin