Improved Italian localization

[mattmilesi]

Added some missing localizations and improved some not-so-correct ones

Status

READY

Description

A few localizations were missing and other ones were badly translated, so I try to make my contribution as an Italian user.

Checklist

• [x] Localized
• [ ] Added to changelog:
  • [ ] [Changelog View] Not added because it's a minor change.
  • [ ] [CHANGELOG.md] Not added because other releases in this changelog don't have a record for localization fixes.

Steps to Test or Reproduce

N.A.

[mattmilesi]

I only saw now that localization is handled with Hosted Weblate. Should I suggest the changes there and close this PR?

[mattmilesi]

I created all the Italian suggestions on Hosted Weblate.

[leits]

Thanks, @mattmilesi!