Worked on the th-ch/youtube-music repository to deliver comprehensive German localization for the user interface, focusing on enhancing accessibility and user experience for German-speaking audiences. Leveraged JSON and Weblate to translate and manage over 450 UI strings, achieving near-complete coverage and integrating a repeatable i18n workflow directly into the codebase. Updated console plugin messages to ensure consistency across the application and established traceable translation references for ongoing maintenance. Emphasized translation management and localization testing readiness, supporting broader adoption in DACH markets. The work demonstrated a methodical approach to i18n, translation, and workflow integration without introducing new bugs.