Worked on expanding Polish localization for the KOReader user interface, help content, and user guide within the koreader/koreaderhub.io.git repository. Focused on increasing translation coverage by updating 663 out of 1951 strings, raising overall localization to 33.9 percent. Leveraged Weblate to integrate Polish translations, establishing a collaborative and repeatable workflow for ongoing internationalization efforts. Applied skills in localization, Polish language, and technical writing to ensure consistency and clarity across UI elements and documentation. No major bugs were addressed during this period, with efforts concentrated on building a foundation for broader language support and streamlined future translation updates.