Charlie delivered a complete Spanish localization for the coopcycle/coopcycle-web repository, translating all 583 interface strings to ensure full language coverage for the JavaScript-based project. He integrated the translations using Weblate, validating their accuracy and consistency across the user interface. To support ongoing internationalization, Charlie established a scalable i18n workflow within the codebase, enabling easier addition of new languages and more efficient translation updates in the future. His work included thorough UI verification to confirm that Spanish strings rendered correctly throughout major application flows, addressing the risk of untranslated keys and enhancing the project’s readiness for multilingual deployment.