Thank you for making things clear. I was not sure whether the plugin did the translation before or WooCommerce itself took care of it.
However, I would like to point out that I already tried the filtering and translating process via Polylang without any success.
Here is the field which I would like to translate: https://i.imgur.com/WvYWZAX.png
Here is the Polylang strings translation page, with the corrections made, as suggested: https://i.imgur.com/BbV18xR.png
And here are the results in English: https://i.imgur.com/bDT9yf4.png
This is actually right, but the translation does not appear on the Hungarian version of the site: https://i.imgur.com/Pk7IpbF.png
Any idea on what may be preventing Polylang from translating this string?
I am also unable to translate any of the other strings which are in the “woo-checkout-field-editor-pro” text domain, but other string translations work just well.
Thank you.