Hi @myhomies
I built a chrome extension to make it easy to translate your bubble app natively. It lets you create the app texts from your page and then export it to the Textonomy portal to manage translations in most languages. Or you could download the app texts as a CSV to translate on your own.
Right now its in beta so its free to test. Let me know if you are interested and I can add you to the beta 
Here’s a rough walkthrough of the tool here (watch it a 1.5x): https://www.youtube.com/watch?v=WaTEHluxUKw
More info here on the forum post: Easy app text management - Chrome extension + tool
So if you set the app to have a path when clicking on the “French” language toggle, and trigger the page to load in French then it should be optimal for SEO, so its www.domain.com/fr; though I think you need to avoid page load triggers and instead save on the user. Can help you there if interested.
Thanks,
Mahir