Worked on the ankitects/anki repository to improve error handling for FSRS parameter validation by localizing error messages and simplifying the mapping of invalid parameters to an existing error type. This update enhanced the accuracy and consistency of user-facing messages across different locales, reducing confusion and support needs. The work involved code refactoring and contributor management, ensuring that changes aligned with ongoing contributor updates. Utilizing FreeMarker and Rust, the developer focused on localization and maintainability, laying the groundwork for future FSRS enhancements. The contribution addressed a specific bug, emphasizing quality improvements in both code structure and the user experience for international audiences.