Hi guys,
From what I get, I think that your issue is not from Polylang. While ACF has now a new hook for i18n for the php exported fields.
Here you can find an exemple : https://github.com/BeAPI/boilerplate-i18n-theme-inc.
After that, you can change i18n strings with Polylang or simply directly by using Poedit or Locotranslate.
In other hand, if you wanna use “theme options”, please use the following add-on to make ACF Option Page support with Polylang : https://github.com/BeAPI/acf-options-for-polylang.
Cheers,
