
Martijn contributed to the thunderbird/thunderbird-l10n repository by delivering a series of localization and UI/UX improvements over four months. He migrated key Thunderbird UI components—including spam terminology, filter dialogs, and archive options—to the Fluent localization system, replacing legacy strings and XUL-based elements to enhance internationalization and maintainability. Using JavaScript and FTL, Martijn introduced new notification systems and updated folder naming conventions, improving accessibility and user experience for global audiences. His work focused on scalable translation workflows and consistent user messaging, demonstrating depth in front end development, localization, and internationalization without direct bug fixes but with substantial feature delivery.
April 2026: Localization improvements for Thunderbird L10n in thunderbird/thunderbird-l10n focused on Archive UI and message retention. Removed XUL tree usage, updated archive/inbox folder name strings, and migrated message retention strings to Fluent to improve internationalization and maintainability. These changes set groundwork for scalable translations and faster locale updates.
April 2026: Localization improvements for Thunderbird L10n in thunderbird/thunderbird-l10n focused on Archive UI and message retention. Removed XUL tree usage, updated archive/inbox folder name strings, and migrated message retention strings to Fluent to improve internationalization and maintainability. These changes set groundwork for scalable translations and faster locale updates.
March 2026 (2026-03) — Delivered Fluent-based localization migration for Filter-related UI components and introduced a Large File Attachment Notification System in Messaging. These initiatives enhance localization accuracy and accessibility, improve user awareness for large files, and advance the repository’s localization readiness and overall user experience.
March 2026 (2026-03) — Delivered Fluent-based localization migration for Filter-related UI components and introduced a Large File Attachment Notification System in Messaging. These initiatives enhance localization accuracy and accessibility, improve user awareness for large files, and advance the repository’s localization readiness and overall user experience.
February 2026: Completed Fluent localization migration for Thunderbird L10n: migrated key UI components to Fluent, including Move To / Copy To menu items, Custom Headers dialog, and compose localization, plus added new localization strings for attachment reminders and notifications. This work enhances localization coverage, accessibility, and user experience while aligning with Fluent adoption and reducing maintenance overhead across UI strings.
February 2026: Completed Fluent localization migration for Thunderbird L10n: migrated key UI components to Fluent, including Move To / Copy To menu items, Custom Headers dialog, and compose localization, plus added new localization strings for attachment reminders and notifications. This work enhances localization coverage, accessibility, and user experience while aligning with Fluent adoption and reducing maintenance overhead across UI strings.
October 2025: Completed standardization of spam terminology in Thunderbird messenger client within thunderbird-l10n. Migrated localization strings from 'Junk' to 'Spam', introduced new Fluent strings for spam-related actions and preferences, and updated existing ones to ensure consistency. Work linked to Bug 1823084 (part 2) with commit 600f786ea157455119765e1692191c837e6f967d. This delivers clearer user messaging, reduces localization drift, and strengthens the Fluent-based localization foundation for future work.
October 2025: Completed standardization of spam terminology in Thunderbird messenger client within thunderbird-l10n. Migrated localization strings from 'Junk' to 'Spam', introduced new Fluent strings for spam-related actions and preferences, and updated existing ones to ensure consistency. Work linked to Bug 1823084 (part 2) with commit 600f786ea157455119765e1692191c837e6f967d. This delivers clearer user messaging, reduces localization drift, and strengthens the Fluent-based localization foundation for future work.

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