Improved italian phone numbers

[Catlike14]

What is the reason for this PR?

• A new feature
• Fixed an issue (resolve #ID)

Author's checklist

• Follow the Contribution Guide
• New features and changes are documented

Summary of changes

Italian phone numbers start with 3 (for mobile) or 0 (for landline). They typically have 10 digits but landlines may also have 9 digits, excluding the +39 international prefix.

Review checklist

• All checks have passed
• Changes are added to the CHANGELOG.md
• Changes are approved by maintainer

[pimjansen]

PR not valid

[Catlike14]

PR not valid

Can you clarify what exactly is invalid? If you're referring to the failed Roave BC Check test, it doesn’t seem related to my changes, as the errors appear to be about other issues

[pimjansen]

• Changes are not documenten in changelog
• There are no unittests

And the change is against 2.c instead of the 1.x branch

[Catlike14]

To be honest, I'm not entirely sure which branch I should have used. I simply found an incorrect format and fixed it without worrying about the branch, also no unit test existed before my change. I'm happy to help write a unit test and open a new PR for 1.x when I have some free time.