It would be great to set the default UI language for MusicBrainz website using user's preferences when the user is logged in. This means adding a custom setting (like "UI/Display language") in the user profile.
For the moment, MB (web application) seems to use the browser default language, which is OK to me if no user is logged in. When a user logs in, the website UI language should match a user-defined language.
Not logged in? → use default browser language (or custom setting in cookies) (=current behavior)
Logged in? → use user profile settings
My browser default language is French, but I prefer using MB in English.
Each time I clear browsing data (cookies, history…), I have to switch MB UI back to English after logging in.