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 his skills in internationalization and localization, Magnus worked primarily with JSON to streamline the translation process and reduce the risk of localization drift. His efforts enhanced the accuracy and maintainability of the Swedish localization, supporting a smoother user experience for Swedish users and simplifying future updates. The work demonstrated careful attention to detail and practical problem-solving in localization workflows.