improved docstring formatting and added safe return in factory method

[ABHIRANJAN-KUMAR1]

Summary

Fixed minor documentation formatting issues and improved code safety.

Details

• Cleaned up unnecessary asterisks in builder.py docstrings for better readability.
• Added default return value in get_localizer (factory.py) to prevent KeyError when unknown language is passed.

Type of Change

• [x] 🐞 Bug Fix (non-breaking change)
• [ ] ✨ New Feature
• [ ] 🧹 Code Cleanup
• [ ] 📚 Documentation Update

Result

Improved documentation consistency and safer behavior in factory.py.

[ABHIRANJAN-KUMAR1]

Please review and merge 😊