(new) web portal language

I'm doing the first steps in the new Web Portal.

It seems, that it takes the browser language for translation, but we need the language defined on the Person Table.
How can I change that behavior?

At the moment, when I try to request a new item I can only see the Ident field, and not it's translations since browser is set to English, but on my Person it is German.
We do not have English translations.

There is also no description shown on the service item. I assume that it also depends on the missing translation.

Any idea?