[xwiki-users] multilingual capabilities of xwiki

Dear XWiki-users, I would like to know how does XWiki support the multiple languages. Is it possible to have the internal sites (e.g. administration interface) in multiple languages and to switch between the different languages? In my installation I changed the Preferences - Parameters and Space Prefs - Parameters in order to support DE and EN (Languages = de, en and Default Language = de). I have the possibility to create/edit pages in those two languages. Reading/viewing a page, the languages of the page are displayed in the top right corner and the user can switch between them. The administration interface, however, is displayed in DE (Default Language) and in the top right corner just "En" is displayed. Switching to EN it is not possible to switch back to DE -- I have to delete the language cookie in order to get the sites in DE again. Can anybody give me more information on that? Thanks a lot! Best regards, Bozana Bokan