How can I determine the application language at run time?

The current language the application is using to display its UI can be retrieved with
TLanguage lang = CEikAppUi::ApplicationLanguageL();
For a non-localized application, this value is TLanguage::ELangNone (0xFFFF).
Note that this value may be different from the language returned by
User::Language();
which represents the language of the current locale (system-wide setting).