[Closed] Strings are not translated

Background of the issue:
this is the website: hidden link
it can be seen in my account but not in the field above.

Problem: not all elements are translated, for example buttons "Add to cart" are on German version or thank-you page after payment is in English doesn't matter what language you were before.

string translation is done,
changing theme did not help
We assume some collision between WPML, WPML String Translation, WooCommerce Multilingual & Multicurrency
Because when we switch off one of the plugins it fixes some problems but then other problems with translations arise.

Symptoms:

Questions: