Improve italian translation

[glughi]

What this PR does

Added some entries to the Italian translation.

Checklist

• There are unit tests to verify my changes are correct or unit tests aren't applicable (if so, write quick reason why unit tests don't exist)
• I've updated relevant documentation in doc/.
• I've updated CHANGES.md with what I changed.
• I've provided instructions in the PR description on how to test this PR.

[niktayv]

Grazie, Giovanni!
LGTM, save for my question about the entries in English.

[glughi]

Hello,
any idea about this stramge check failing?

[niktayv]

Hello, any idea about this strange check failing?

This may be related to the version of Firefox used in CI.
The core team is investigating this issue.

[zoran995]

Hi @glughi, the CI issue was fixed 2 weeks ago; you need to merge the latest main into this branch (it is currently 9 commits behind main).
Note: It is usually better to do translations using the Weblate system and have Weblate create a PR with the updated translation. We can merge this and see how Weblate will react to it. If it proves to be too much trouble, then we will have to revert it, and you will need to update translations using Weblate.

[glughi]

Hello @zoran995 and @niktayv, any news about this PR?