Worked on the integratedmodelling/esa.aries.sandbox repository to establish foundational internationalization and localization support, focusing on enhancing the test site selection feature. The approach involved externalizing the test site description into a localization file, enabling future multi-language capabilities and reducing ongoing localization costs. Refactored the user interface by replacing checkbuttons with a combobox, streamlining the selection process and improving usability for users across different regions. Leveraged skills in UI/UX refinement and internationalization, using the K programming language to prepare the codebase for broader global reach. The work laid essential groundwork for scalable, multilingual user experiences in upcoming releases.