mettre en place une gestion multi-lingue compatible weblate

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The issue title mentions setting up multi-language management compatible with Weblate, but the body is empty. Research would involve examining the repository's current structure for any existing i18n setup, understanding how Weblate integrates with JavaScript projects, and identifying the files and configurations needed for translation workflows. A newcomer would need to determine the scope, such as which parts of the application require localization and how to structure translation keys.

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