During May 2025, Matěj Latka delivered Czech localization updates for the electricitymaps-contrib repository, focusing on enhancing user experience for Czech-speaking users. He managed translation keys and values using JSON, applying internationalization and localization best practices to expand language coverage. The work involved a disciplined pull request workflow, including code review and repository-wide updates, ensuring consistency and maintainability. By improving localization accessibility, Matěj supported broader adoption in the Czech market. Although the scope was limited to a single feature and no bugs were reported, the contribution demonstrated a thorough end-to-end approach to language integration within a collaborative development environment.