I don’t know if this will help you, because I don’t do the commerce thing.
After I changed the Last Name First Name in the Contact Form, I then realized that I ran into the same problem in a survey form, I needed to translate the Agree/Disagree choices.
Not being a coder, @groundcontact’s answer from August 24 was too complex, so I played with the August 19 answer and changed the LastName/First Name as I had done in my Contact Form, pasting the code to handle the response translations.
By looking for the ClassName in the page source, I then changed it to the class name I had found for the s