We have the option to use Adyen for languages that other iframes don't have. Ukrainian seems like a great place to try this out as we currently have no coverage there.
Here's information about how: https://docs.adyen.com/manuals/skin-manual/managing-skins-in-the-adyen-ca/skin-configuration/extra-options
And an attached resource file.
From what they said while @Ppena and I were there in person, we should be able to customize the resource file with whatever/however many languages we want and then call those from the form.
It is possible to edit these via the Customer Area but it is clunky and not easy for lots of edits. Attached is a resource file that would be used to edit all the strings in the Skin. You would need to look at the HPP and decide what fields need what text. Once you edit this file, you would include this when uploading the skin and when you pass the language code it will render whatever is present in the resource file.