Phel Phearoun worked on modernizing internationalization workflows in the thunderbird-l10n repository, focusing on migrating the Search Dialog’s localization assets from legacy DTD and properties files to the Fluent format. This migration established a scalable foundation for translations, streamlining future updates and reducing maintenance overhead. By leveraging Fluent and applying localization and internationalization best practices, Phel enabled faster localization cycles and improved language coverage for Thunderbird. The work aligned the repository with current Fluent tooling and syntax, minimizing translation drift and future refactoring costs. Over the month, Phel delivered a foundational feature that supports ongoing improvements in Thunderbird’s localization process.