Magnus Österlund focused on improving Swedish localization within the electricitymaps-contrib repository by synchronizing sv.json with the core en.json file. He addressed duplicated strings and corrected formatting inconsistencies, ensuring that the Swedish language files accurately reflected updates in the English source. Using skills in internationalization and localization, Magnus worked primarily with JSON to streamline the translation process and reduce future maintenance overhead. His efforts enhanced the accuracy and consistency of the Swedish user experience, minimizing localization drift. The work demonstrated careful attention to detail and a methodical approach to maintaining high-quality, maintainable language resources in a collaborative open-source environment.