oAuth Login is working just fine, the only problem we are facing is to have the opportunity to change the language of the interface of the login screen.
Is this possible?

We are using this in a Community with a cutom login page.
Adding querystring params to the url (/services/oauth2/authorize) are of course wiped out...
So when landing on the custom login screen (after the redirect), we have no clue in what language the user want this.