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.
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On this site, the reset password email is in French. https://www.amoodz.com/
At this point I might as well ask. Has anyone ever been able to produce, or has anyone ever seen, a Wix password reset email in Spanish? I'm wondering if it's even supported at all (let alone whether I can access it).
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
https://support.wix.com/en/article/request-customizing-the-reset-password-email