thunderbird/thunderbird-l10n
Oct 2025 – Jun 2026
8 Months active
Languages Used
FTLJavaScript
Technical Skills
Localizationfront end developmentinternationalizationlocalizationFluentJavaScript
Onno Ekker
PROFILE
Onno Ekker
Worked extensively on the thunderbird/thunderbird-l10n repository, delivering a series of localization and UI/UX enhancements over eight months. Focused on migrating legacy DTD and properties files to the Fluent localization framework, this developer improved internationalization support and streamlined translation workflows across Thunderbird’s user interface. Leveraging JavaScript and Fluent, they modernized key UI components such as account creation, search dialogs, folder properties, and spam management features. Their work included implementing user-facing prompts for destructive actions, enhancing notification UX, and consolidating localization resources, resulting in more maintainable code and a consistent experience for global users without introducing new bugs during the period.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
24Total
Bugs
0
Commits
24
Features
11
Lines of code
390
Activity Months8
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360 peopleShared Repositories
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Work History
June 2026
3 Commits • 2 Features
Jun 1, 2026June 2026 (thunderbird/thunderbird-l10n): Delivered Fluent localization migration for folder properties and subscribe UI, and enhanced Virtual Folder Properties UX with empty-search-folder feedback. Key contributions include migrating localization strings from DTD to Fluent (Bug 2044775; 2045295) and adding an empty state message when no search folders are selected (Bug 2044980). Overall impact: stronger internationalization support, streamlined localization maintenance, and clearer user guidance, contributing to a better global user experience with minimal UI risk. Technologies/skills demonstrated include Fluent localization tooling, i18n best practices, UI/dialog updates, and cross-repo collaboration within Thunderbird localization workflows.
3 Commits • 2 Features
Jun 1, 2026June 2026 (thunderbird/thunderbird-l10n): Delivered Fluent localization migration for folder properties and subscribe UI, and enhanced Virtual Folder Properties UX with empty-search-folder feedback. Key contributions include migrating localization strings from DTD to Fluent (Bug 2044775; 2045295) and adding an empty state message when no search folders are selected (Bug 2044980). Overall impact: stronger internationalization support, streamlined localization maintenance, and clearer user guidance, contributing to a better global user experience with minimal UI risk. Technologies/skills demonstrated include Fluent localization tooling, i18n best practices, UI/dialog updates, and cross-repo collaboration within Thunderbird localization workflows.
June 2026
April 2026
1 Commits • 1 Features
Apr 1, 2026April 2026 (Month: 2026-04) monthly summary for thunderbird/thunderbird-l10n. Key feature delivered: A user-facing warning prompt for permanent deletion of old messages, informing users about the consequences and requiring explicit confirmation before action on both external servers and local storage. This improves data safety by reducing accidental deletions and helps enforce retention policies. Localization progress: Part 2 of migrating message retention strings to Fluent, enabling more consistent translations and easier future updates across locales. Major bugs fixed: None reported in this repo for this month; efforts were focused on feature delivery and localization improvements. Overall impact: Increased user safety around data deletion, improved localization readiness, and stronger alignment with product retention policies. Technologies/skills demonstrated: Fluent-based localization, UI/UX considerations for destructive actions, cross-repo collaboration on retention strings, and maintainable commit-driven development.
April 2026
1 Commits • 1 Features
Apr 1, 2026April 2026 (Month: 2026-04) monthly summary for thunderbird/thunderbird-l10n. Key feature delivered: A user-facing warning prompt for permanent deletion of old messages, informing users about the consequences and requiring explicit confirmation before action on both external servers and local storage. This improves data safety by reducing accidental deletions and helps enforce retention policies. Localization progress: Part 2 of migrating message retention strings to Fluent, enabling more consistent translations and easier future updates across locales. Major bugs fixed: None reported in this repo for this month; efforts were focused on feature delivery and localization improvements. Overall impact: Increased user safety around data deletion, improved localization readiness, and stronger alignment with product retention policies. Technologies/skills demonstrated: Fluent-based localization, UI/UX considerations for destructive actions, cross-repo collaboration on retention strings, and maintainable commit-driven development.
March 2026
3 Commits • 2 Features
Mar 1, 2026March 2026 monthly summary for thunderbird/thunderbird-l10n: Focused UI modernization and user-facing improvements through Fluent UI migration and Filelink-guided notifications, with migration bug fixes to enable a stable rollout. This period delivered measurable business value through enhanced accessibility, UI consistency, and improved handling of large attachments, while maintaining strong traceability for localization work.
3 Commits • 2 Features
Mar 1, 2026March 2026 monthly summary for thunderbird/thunderbird-l10n: Focused UI modernization and user-facing improvements through Fluent UI migration and Filelink-guided notifications, with migration bug fixes to enable a stable rollout. This period delivered measurable business value through enhanced accessibility, UI consistency, and improved handling of large attachments, while maintaining strong traceability for localization work.
March 2026
February 2026
12 Commits • 2 Features
Feb 1, 2026February 2026 saw a focused drive on localization modernization and user experience improvements in the thunderbird-l10n repository, delivering Fluent-based localization across Thunderbird UI and chat, and enhancing messaging UX with reliable notifications and opening-messages prompts. This included a broad migration of UI strings away from legacy localization systems, consolidating localization updates under Fluent to improve internationalization and readability while simplifying future translations. Key contributions: - Implemented Localization Improvements across UI (Thunderbird and chat), consolidating localization updates to Fluent and migrating multiple components to ensure consistent translations and UI text quality. - Delivered Messaging UX enhancements, including consolidated chat notifications and opening-messages confirmation prompts to improve user experience. - Executed a broad migration from PluralForm.sys.mjs to Fluent across several modules (virtualFolderProperties, Move To/Copy To menus, FilterEditor, cookies, feed-subscriptions, newmailalert, compose, msgHdrView, and related UI components), reducing reliance on obsolete localization infrastructure and lowering maintenance risk. - Achieved improved internationalization coverage and readability across the UI, supporting a better onboarding experience for translators and end-users in multiple locales. Impact and accomplishments: - Business value: stronger, more consistent localization supports a larger user base with clearer UI strings, reducing translation drift and customer support friction. - Technical sustainability: centralized Fluent-based localization enables smoother future UI changes and faster iteration cycles for translations. - Quality gains: fewer localization regressions due to unified string management and improved validation across UI surfaces. Technologies/skills demonstrated: - Fluent localization framework, i18n strategy, and cross-repo refactoring - Large-scale migration planning and execution across multiple modules - UX design enhancements for messaging and notification UX - Commit-level traceability and documentation through descriptive messages
February 2026
12 Commits • 2 Features
Feb 1, 2026February 2026 saw a focused drive on localization modernization and user experience improvements in the thunderbird-l10n repository, delivering Fluent-based localization across Thunderbird UI and chat, and enhancing messaging UX with reliable notifications and opening-messages prompts. This included a broad migration of UI strings away from legacy localization systems, consolidating localization updates under Fluent to improve internationalization and readability while simplifying future translations. Key contributions: - Implemented Localization Improvements across UI (Thunderbird and chat), consolidating localization updates to Fluent and migrating multiple components to ensure consistent translations and UI text quality. - Delivered Messaging UX enhancements, including consolidated chat notifications and opening-messages confirmation prompts to improve user experience. - Executed a broad migration from PluralForm.sys.mjs to Fluent across several modules (virtualFolderProperties, Move To/Copy To menus, FilterEditor, cookies, feed-subscriptions, newmailalert, compose, msgHdrView, and related UI components), reducing reliance on obsolete localization infrastructure and lowering maintenance risk. - Achieved improved internationalization coverage and readability across the UI, supporting a better onboarding experience for translators and end-users in multiple locales. Impact and accomplishments: - Business value: stronger, more consistent localization supports a larger user base with clearer UI strings, reducing translation drift and customer support friction. - Technical sustainability: centralized Fluent-based localization enables smoother future UI changes and faster iteration cycles for translations. - Quality gains: fewer localization regressions due to unified string management and improved validation across UI surfaces. Technologies/skills demonstrated: - Fluent localization framework, i18n strategy, and cross-repo refactoring - Large-scale migration planning and execution across multiple modules - UX design enhancements for messaging and notification UX - Commit-level traceability and documentation through descriptive messages
January 2026
1 Commits • 1 Features
Jan 1, 2026January 2026 focused on establishing Fluent-based localization for the account creation flow in Thunderbird. Delivered the migration of accountCreationModel to Fluent, enabling multi-language support and a foundation for faster translation cycles. This work reduces onboarding friction for non-English users and aligns with the product's localization strategy. No other major features or bug fixes completed this month beyond the migration tasks.
1 Commits • 1 Features
Jan 1, 2026January 2026 focused on establishing Fluent-based localization for the account creation flow in Thunderbird. Delivered the migration of accountCreationModel to Fluent, enabling multi-language support and a foundation for faster translation cycles. This work reduces onboarding friction for non-English users and aligns with the product's localization strategy. No other major features or bug fixes completed this month beyond the migration tasks.
January 2026
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025: Delivered localization modernization for thunderbird-l10n by migrating the Search Dialog from DTD/search.properties to Fluent. This move enhances internationalization support, enables dynamic messaging, and lays groundwork for scalable translations. Changes are tracked under Bug 2000811 with commit d99729891d1d6edb840b89a76eb810ff102b2c45.
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025: Delivered localization modernization for thunderbird-l10n by migrating the Search Dialog from DTD/search.properties to Fluent. This move enhances internationalization support, enables dynamic messaging, and lays groundwork for scalable translations. Changes are tracked under Bug 2000811 with commit d99729891d1d6edb840b89a76eb810ff102b2c45.
November 2025
2 Commits • 1 Features
Nov 1, 2025Monthly summary for 2025-11 focusing on Localization and Internationalization enhancements in Thunderbird UI within the thunderbird/thunderbird-l10n repository. Implemented Fluent-based localization, added new author-related localization strings in the message list, and migrated error-related messages to Fluent to improve internationalization support and user-facing clarity. This work reduces localization maintenance overhead and enables smoother locale expansion.
2 Commits • 1 Features
Nov 1, 2025Monthly summary for 2025-11 focusing on Localization and Internationalization enhancements in Thunderbird UI within the thunderbird/thunderbird-l10n repository. Implemented Fluent-based localization, added new author-related localization strings in the message list, and migrated error-related messages to Fluent to improve internationalization support and user-facing clarity. This work reduces localization maintenance overhead and enables smoother locale expansion.
November 2025
October 2025
1 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary for thunderbird/thunderbird-l10n: Focused on delivering localization migration for spam-related strings and establishing user-controlled spam management features. Implemented migration of localization strings from Junk to Spam in mail messenger preferences, introduced new Fluent strings for moving messages to 'Anders' and for auto-deletion of spam after configurable days, as part of localization resource consolidation. These changes improve localization coherence, enhance user control, and reduce future maintenance overhead.
October 2025
1 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary for thunderbird/thunderbird-l10n: Focused on delivering localization migration for spam-related strings and establishing user-controlled spam management features. Implemented migration of localization strings from Junk to Spam in mail messenger preferences, introduced new Fluent strings for moving messages to 'Anders' and for auto-deletion of spam after configurable days, as part of localization resource consolidation. These changes improve localization coherence, enhance user control, and reduce future maintenance overhead.
Activity
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Quality Metrics
Correctness99.2%
Maintainability98.4%
Architecture98.4%
Performance98.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
FTLJavaScript
Technical Skills
FluentFluent UIJavaScriptLocalizationUI/UX DesignUI/UX designfront end developmentinternationalizationlocalizationsoftware developmentuser interface design
Repositories Contributed To
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