Amazon Gaming app problem with languages

I wonder if I'm the only one to experience this....

I received Batman - The Telltale Series via the Amazon Prime Gaming app. I live in Germany, but my Prime account is set to English. The APGapp interface is set to English. If I play a Batman game, I definitely want it in English.

The APGapp installed BtTS in German. And the APGapp helpdesk said I should take it up with Telltale.

For anyone who hasn't tried it, the APGapp is only a rudimentary platform. You can't make any installation decisions. You can't adjust the downloading rate, either. And if your rig lapses into snooze while downloading, you'll need to start over.