XWIKI-11285: No way to switch back to original language after looking to a translation
* Fixed the display of the languages, to display on top the current language, and in the submenus the other languages of the document, including original language of document + translations
* Fixed the display of the language pretty name, to display the language in the language itself, this way when switching to Chinese and wanting to go back to english, english will be displayed as "English"
(cherry picked from commit 6728f53d07460afe26d3d54d25920c9c9bb7be17)