A customer filed a Service Request with Oracle Support, asking the following:
In Apex 4, Irrespective of the Client OS / Locale / Browser Language settings, the Language picked up the interface shows as “ Language: en “ . Where as from the same browser/client if I login into Apex.3.2.1, it shows the correct language as "DE" , "TH", "FR", etc.,
Has anybody seen this issue? Am I missing something?
This is expected behavior. In Application Express 4.0, the development environment uses the new "Session" language derivation, bringing it in line with modern Web applications which do not use the browser language as the primary language preference. This new language derivation type is documented briefly here and additionally in the item-level help.
If you go to the Login page of apex.oracle.com, you’ll see the language bar at the bottom. This language list is determined by the translated versions of Application Express which are installed in the instance. You can change your language preference from this language bar or within Application Express too. The language preference is "remembered" via a persistent cookie.