This support ticket is created 2 years, 8 months ago. There's a good chance that you are reading advice that it now obsolete.
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Q1) I tested in English and it seems to work there, however when we switch to German, we don't even see the 4 categories
For German version, I have added below JS codes into your website: hidden link
section "Search and Pagination", box "JS editor", line 19~23:
// German version
jQuery('input[value="nn-faq-de-hilfe-seite"]').parent('div.form-check').show();
jQuery('input[value="nn-faq-de-native-nanny-werden"]').parent('div.form-check').show();
jQuery('input[value="nn-faq-de-familie"]').parent('div.form-check').show();
jQuery('input[value="nn-faq-de-techsupport"]').parent('div.form-check').show();
As you can see, they are German version of term slugs.
Q2) Also, when we click an FAQ to open it, they all open at once, instead of just the one opening and closing.
Since you are using Booststrap according to setup the those JS effect, you can follow their document to setup it: hidden link
The problem is: You need to setup the unique ID for each accordion
I have setup a demo in your website, hidden link
section "Loop Editor", change line 7 to: