[Закрытые] String translation doesn't appear in the front end

Background of the issue:
I'm trying to show translated strings in Acowebs Woocommerce Custom Product Addons on the front end of my site скрытая ссылка. The issue can be seen on this page: скрытая ссылка. I had the same issue 7 months ago and referred to this documentation: https://wpml.org/forums/topic/ive-translated-strings-in-acowebs-woocommerce-custom-product-addons-but-the-translation-doesnt-s/

Symptoms:
String translation doesn't appear in the front end.

Questions:
How can I ensure that translated strings appear correctly in the front end?
Is there a specific setting in WPML or Acowebs Woocommerce Custom Product Addons that I need to adjust?