[ar] add missing Arabic translations to CI 4.6

[aboosamah94]

Description
Added missing Arabic translation file:

🆕 New file:

• Language.php

✅ Updated existing translation files:

• Cache.php
• Cast.php
• CLI.php
• Cookie.php
• Core.php
• Database.php
• Email.php
• Encryption.php
• Errors.php
• Fabricator.php
• Files.php
• Filters.php
• Format.php
• HTTP.php
• Images.php
• Log.php
• Migrations.php
• Number.php
• Pager.php
• Publisher.php
• RESTful.php
• Router.php
• Security.php
• Session.php
• Test.php
• Time.php
• Validation.php
• View.php

Checklist:

• Language files updated in language/ar/

[paulbalandan]

Please fix the code style issues.