Worked on the th-ch/youtube-music repository to deliver a comprehensive Polish localization enhancement, focusing on expanding accessibility and improving user experience for Polish-speaking users. Utilized JSON and Weblate to achieve a near-complete translation pass, covering 99.1% of application strings, including plugin loading messages and developer tools notifications. The approach emphasized maintaining core functionality while introducing accessibility improvements, such as better handling of clock features and Chinese character conversion. Contributed to documentation and workflow improvements for ongoing i18n and localization maintenance, ensuring smoother future updates. No bugs were reported, and the work resulted in broader reach and improved usability for the target audience.