Obvious possibilities include German being the most used non-English language for Skype users, or that they're going to be adding other languages but their tran

Obvious possibilities include German being the most used non-English language for Skype users, or that they're going to be adding other languages but their translators haven't yet written them. The only guess I have that isn't from an obvious reason is that Skype HQ is in Luxembourg, a small country right next to Germany. One of the three official languages there is German, and the other is Luxembourgish, which is closely related to German.