addressed issue https://github.com/globaleaks/GlobaLeaks/issues/926

the branch is ready for merge and has a twin on GLClient repository
1) yes we want all the languages enabled by default to allow the wizard to be localized. then after the wizard the node appear configured with only the chosen language enabled and setted as default

2) nope. LANGUAGES_SUPPORTED_CODES is in the format ['it', 'en']