Worked on the FreeTubeApp/FreeTube repository to deliver a comprehensive Polish language localization, achieving 99.8% UI coverage through Weblate-based translations. Focused on internationalization and localization, the work involved translating nearly all user interface strings using YAML, while also enhancing accessibility for Polish-speaking users by aligning UI elements with accessibility best practices. No major bugs were addressed during this period, as the primary goal was to expand the user base and improve user experience through high-quality translation and consistent UX. Additionally, established and documented a localization workflow to support ongoing internationalization efforts and maintain UI stability during rollout.