Delivered full Korean UI localization for the th-ch/youtube-music repository, translating all 477 interface strings including labels and tooltips for Chinese character conversion features. Leveraged a Weblate-driven translation workflow to ensure consistency and traceability across the frontend, focusing on internationalization (i18n) and localization best practices. The work was implemented using JSON for translation data, with close collaboration alongside translation teams to validate accuracy. This feature improved accessibility for Korean-speaking users, reduced the localization backlog, and positioned the product for regional growth. No major bugs were documented during this period, reflecting a focused and methodical approach to feature delivery.