Developed and delivered full French (fr-FR) localization for the AionUi Desktop repository, focusing on expanding accessibility and market reach for French-speaking users. The work involved implementing comprehensive translations, updating language configuration files, and introducing resolution logic to ensure seamless locale detection. A UI language switcher was added to allow users to toggle between languages, reinforcing usability and laying the foundation for future locale support. The project was executed using React and TypeScript, leveraging frontend and i18n best practices. This feature established a central scaffolding for internationalization, streamlining future translation efforts and supporting broader adoption in Francophone markets.