Italian Localization (#3388)

* Italian Localization

New strings translated for v.1.75

* Update messages.po

Changed two expressions following the revision of @marcomaroni

* Update messages.po

Additional changes to text applied following the suggestion of external translators.

* Update messages.po

Deleted extra stop and corrected a gramatical error

* Update messages.po

Added a correction on string 414 which had a grammatical error.

* Update messages.po

String with Labeler updated.

* Update messages.po

Additional changes made to wordings in traduced strings