added italian translation

Signed-off-by: Giovanni Vinaccia <vinaccia.giovanni@gmail.com>
added italian translation

Signed-off-by: Giovanni Vinaccia <vinaccia.giovanni@gmail.com>
Merge branch 'it-translation' of github.com:gvinaccia/redmine_backlogs into it-translation

Conflicts:
	config/locales/it.yml

Signed-off-by: Giovanni Vinaccia <vinaccia.giovanni@gmail.com>
Merge pull request #1045 from gvinaccia/it-translation

It translation