Ertac focused on improving the Turkish localization of the admin UI in the medusajs/medusa repository, addressing translation inconsistencies and missing content across inventory management, customer groups, order fulfillment error messages, promotions, and shipping options. Working with JavaScript and TypeScript, Ertac applied frontend development and internationalization skills to enhance the accuracy and completeness of Turkish translations. This targeted bug fix improved the user experience for Turkish-speaking administrators and reduced localization-related support issues. The work involved updating translation files, reviewing code for quality assurance, and ensuring that the admin interface better supports Turkish market operations through more reliable localization.