I was able to change the language of the reset password prompt using: wixUsers.promptForgotPassword("es"); But then the password reset email is in English, AND clicking the link from that email gives a reset password form in English as well.

Change language of reset password email

mikhail-spirin-wix September 10, 2019, 9:31am 3

Customizing of reset password is not possible, correct
But regarding language - it can be changed. Try to change this language:
https://screencast.com/t/UpqWaUNH

Change language of reset password email