I have done some more research, and I think the error is due to the fact your template defines the “en” language in the html (see the first tag – html) you probably need to change this to de
Nimefanya baadhi ya utafiti zaidi, na nadhani kosa ni kutokana na ukweli template yako amefafanua “na” lugha katika html (kuona tag kwanza – html) wewe pengine haja ya hii mabadiliko na de