Developed a scalable internationalization framework for the epam/ai-dial-chat repository, enabling dynamic runtime locale management and a robust language selector across the chat UI, marketplace, and related modules. Leveraging React, Next.js, and TypeScript, the work expanded i18n coverage to include chat interfaces, publication flows, sidebars, promptbars, and marketplace search filters. Addressed right-to-left (RTL) UI challenges by implementing precise layout fixes, such as toggle switch alignment and avatar spacing, to ensure consistency for RTL languages. These enhancements improved global accessibility, streamlined localization, and positioned the product for broader adoption in multilingual environments, reflecting a thoughtful approach to internationalization.