[Resolved] Trying to translate woocommerce front end fields

Background of the issue:
I am trying to translate some fields on the WooCommerce checkout page on my site hidden link. I have already followed the documentation provided by WPML: https://wpml.org/documentation/getting-started-guide/string-translation/finding-strings-that-dont-appear-on-the-string-translation-page/ but still no luck.

Strange thing with "Theme and plugin localization": it keeps saying "need to rescan" even after adding thousends of strings in the scan before..

Symptoms:
The fields I want to translate do not show up in string translation.

Questions: