CONNOBR-472 Validate French public IBANs

[Sofjins]

CONNOBR-472

• Added a list of FR public IBANs
• Added a check to validate IBAN with according error message

[Copilot]

Pull Request Overview

This PR implements validation for French public IBANs by adding a blacklist of publicly known IBANs that should be rejected during validation. The implementation includes a YAML data file containing 87 French public IBANs and integrates this check into the main IBAN validation flow.

• Adds a new validation method not_a_public_iban? that checks French IBANs against a blacklist
• Integrates the public IBAN check into the main valid_iban? validation method
• Provides localized error messages in 13 languages for when a public IBAN is detected

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 4 comments.

File	Description
lib/ibandit/iban.rb	Adds not_a_public_iban? method and integrates it into main validation
data/french_public_ibans.yml	New YAML file containing list of 87 French public IBANs
spec/ibandit/iban_spec.rb	Adds tests for the new validation and updates test fixture
config/locales/*.yml	Adds error message translations in 13 languages

[JoeSouthan]

As discussed, I'm not sure this is the right approach.

[Sofjins]

Closing, since it appeared the wrong place to insert these changes