lang: [it] Added the remaining translations for the Italian language

[Franky5831]

Description
I added the remaining translations for the Italian language.
I noticed some translations were missing, I translated all the remaining strings (I am Italian).

I took some light liberties on the following translations:

1. bannedUser => I translated "you are currently banned" to "l'account è stato disabilitato" which means "the account has been disabled"
2. logOutBannedUser => I translated "you have been banned." to "l'account è stato disabilitato." which means "the account has been disabled"
3. invalidEmail => "the email address "{0}" matches the email on record." to "l'indirizzo email "{0}" corrisponda ad un indirizzo registrato." which means "the "{0}" email address matches with a registered one."
4. I kept "Token" as such, we don't have a word for that

Please let me know if you prefer a more more literal translation.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[datamweb]

4. I kept "Token" as such, we don't have a word for that

So, please update the test using Auth.token:

final class ItalianTranslationTest extends AbstractTranslationTestCase
{
    protected array $excludedLocaleKeyTranslations = [
        'Auth.password',
        'Auth.login',
    ];
}

[Franky5831]

@datamweb I did it.
Also, just like in the "CzechTranslationTest" class I removed "Auth.password" and "Auth.login" from the "$excludedLocaleKeyTranslations" array.
For reference, this is the class: https://github.com/codeigniter4/shield/blob/develop/tests/Language/CzechTranslationTest.php