Hello, How can I implement multi-language support for the embedded registration and login pages in my Wix app?

I have created an app in Wix that includes seller registration and login pages embedded via URLs in an iframe/script. I want to add multilingual support for these pages and the app overall. How can I implement multi-language support for the embedded registration and login pages in my Wix app?

Product:
Wix Editor

I want the embedded pages (seller registration and login) to automatically display in the user’s selected language or switch languages dynamically, integrated smoothly with the rest of my Wix site/app.

What I’ve tried:
I have looked into Wix Multilingual features but since these pages are embedded via external URLs, I’m unsure how to manage translations or language switching for them.

Additional information:
The embedded pages come from a third-party URL or external system, so I don’t have direct control over their content inside Wix. Any guidance on best practices for multilingual support in such embedded scenarios would be appreciated.