Théo Chevalier is a localization and translation consultant with 14 years of experience helping global organizations make products feel native to diverse audiences. Based in Toulouse, he partners with campaigners, engineers, designers and content strategists to launch globally-localized campaigns managed by volunteer communities and LSPs. A hands-on contributor to Mozilla projects like Common Voice and Firefox Profiler, he blends Fluent-based i18n work with practical front-end fixes to resolve hardcoded strings and UI rendering issues. He runs L10n Conseils and has a master's from Université Paul Sabatier, combining academic grounding with deep, open-source localization practice. Notably, his contributions to voice and privacy-focused Mozilla projects reflect a focus on making cutting-edge services accessible in French and other languages.
14 years of coding experience
High school diploma, High school diploma at Lycée Jules Fil
Master's degree, Master's degree at Université Paul Sabatier (Toulouse III)
Associate's degree, Associate's degree at Lycée Paul Sabatier
DEPRECATED - Gaia is a HTML5-based Phone UI for the Boot 2 Gecko Project. NOTE: For details of what branches are used for what releases, see
Role in this project:
Localization / Internationalization Specialist
Contributions:81 commits, 15 PRs, 4 comments in 2 years 7 months
Contributions summary:Théo primarily focused on localizing the Firefox OS (Boot to Gecko) project, addressing hardcoded strings and inconsistencies. They made multiple commits that involved modifying various files (HTML, CSS, JavaScript) across different apps to replace hardcoded English strings with localized counterparts and address reuse of strings in multiple contexts. The user also contributed to fix issues related to UI rendering in different languages and corrected language-specific display elements.
Common Voice is part of Mozilla's initiative to help teach machines how real people speak.
Role in this project:
Localization / Internationalization Specialist
Contributions:218 commits, 2 PRs, 5 comments in 4 years 11 months
Contributions summary:The user, Théo Chevalier, primarily focused on updating the French (fr) localization of the Common Voice project. Their contributions involved modifying various messages within the `web/locales/fr/messages.ftl` file. The changes ranged from translating UI elements, adding new sentence domains, fixing errors, to adapting the user interface for the French language and the project's needs.
internet-freedommachinesinitiativeopen-datavoice
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Théo Chevalier - Consultant En Traduction at L10n Conseils