[FIX] It is not possible to select back 'unknown' as page language once a...
requested to merge Domeshow/tiki:fix_not_possible_to_select_back_unknown_as_page_language into master
Once you have selected a language for a page (Editing => Properties or on page creation) other than "unknown" you can’t select back "unknown".
Sometimes it is better to keep a wiki page language as unknown and use the TR tags (plugins) to have a page adapting to different language. Therefore it is important to keep the option to have language=unknown pages.
Edited by luci