You have an iframe in your page and you need to translate it.
Pre-required
You need to have the iframe control to put Weglot snippet on the iframe.
If you cannot put the snippet in the iframe, please contact us, we surely have another solutions for you.
Setup
The parent window (main page) got the Weglot snippet to initialize it and there is a switcher on this page.
1) You have to put the same snippet in your iframe page, with the hide_switcher extra option to true, because you don't want another switcher in your iframe: