in Gensoukyou, women rape men!

Why is Koa speaking german here?
And why is she not making any sense at all?

If I'm not mistaken the German bit reads "Yes. One master" So yeah it doesn't really make sense.

One "m" is missing. I added an explanation.

Why is this tagged as translated when only Koa's lines are translated?

Deursch?

Jawohl!

Yes. A master.

Hellsing reference??