If I set my browser language preferences to French (fr), then English UK (en-GB), Web UI still displays in English. My http header is:
Accept-Language:fr,en-GB;q=0.8,en;q=0.6,en-US;q=0.4
and Chrome is being displayed in English, such that window.navigator.language = "en-GB", but this should NOT determine in which language to return page content.
Note that the JSF dashboard DOES honour the http headers correctly