During February 2025, Ivan Ivanov delivered a Bulgarian localization update for the Stirling-Tools/Stirling-PDF repository, focusing on aligning the application's UI strings with current translations to enhance accessibility for Bulgarian-speaking users. He updated the messages_bg_BG.properties file using Java, applying internationalization and localization best practices to improve user experience consistency and clarity. The work was structured as a single, dedicated change-set, facilitating efficient quality assurance and release readiness. While the scope was limited to feature development without bug fixes, Ivanov’s contribution addressed a specific need for language support, demonstrating attention to detail in adapting software for a multilingual audience.