As I can't find a proper way to do this, I'll just drop this here : I run a website where anyone can post offers from fontend.

I want the website to be multi language with switcher and/or browser language detection.

However, I can't produce simply translated post : as users post from frontend, I can't ask them to post 2 times. And I can't make it by myself each time someone post or delete, as it would be too much to handdle.

I tried polylang and so on, that need multiple post, one for each language.

I would need : a way to translate evrything with switcher or browser language detection without multi post OR a way to automaticaly create translated post on the fly.

Any hints ?