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Is set to the visible backend language in the backend only (Interface language). In the frontend, it is NOT defined! It indicates a backend user and his currently selected language. Use this in methods that are intended for backend use only. It MUST NOT be used to determine the language for any kind of content!
Is set to the selected frontend or content language both in the back- and frontend. It always represents the language of content being viewed or edited. Use FRONTEND_LANG_ID for that purpose only!
Is set to the same value as BACKEND_LANG_ID in the backend, and to the same value as FRONTEND_LANG_ID in the frontend. It always represents the current users' selected language. It *MUST NOT* be used to determine the language for any kind of content!
FWLanguage::getMenu($selectedId=0, $menuName='', $onchange='')
FWLanguage::getMenuActiveOnly($selectedId=0, $menuName='', $onchange='')