It would be great, if Discourse honors Accept-Language HTTP header for not logged in users. If I visit Discourse in a private mode or log out, I see it in English, despite the Czech localization exists. The only way, how to set it up, is to log in and have Czech set in my account preferences.
If Discourse shows the page localized based on Accept-Language header send by the browser, it would be much easier to use it e.g. for local community or local support forums too (for those, who do not want to maintain care about standalone community system or do not want to use SUMO as a local support platform).