Update js/locales/bootstrap-datepicker.fr.js

Specify default format for French language.
Updated readme to cover language changes
Now supports full IETF codes & 2 letter codes

The IETF code (eg  "en" for English, "pt-BR" for Brazilian Portuguese) of the language to use for month and day names.  If a full code (eg "de-DE") is supplied the picker will first check for an "de-DE" language and if not found will check for a "de" language.
Update js/locales/bootstrap-datepicker.it.js
Merge pull request #321 from Pasvaz/patch-1

Update js/locales/bootstrap-datepicker.it.js
Merge pull request #320 from johnnyreilly/master

Now supports full IETF codes & 2 letter codes
Merge pull request #319 from fabdouglas/patch-2

Update js/locales/bootstrap-datepicker.fr.js