[it] Updated italian strings

[Zio3D]

Updated with nine new Italian strings.

[paulbalandan]

Please add the missing key also for Errors:

1) Translations\Tests\ItalianTranslationTest::testAllConfiguredLanguageFilesAreTranslated with data set "it" ('it')
Failed asserting that language file "Errors.php" in the main repository is translated in "it" locale.
Failed asserting that an array is empty.

[paulbalandan]

Please also run vendor/bin/php-cs-fixer fix -v

[Zio3D]

Ok, added the "Errors.php" file. Executed "vendor/bin/php-cs-fixer fix -v" and all files are correct.

[MGatner]

Rerunning failed jobs.

[paulbalandan]

Thank you, @Zio3D