Maruf Shidiq developed Indonesian localization for core privacy controls in the c15t/c15t repository, focusing on cookie consent and privacy management interfaces. He introduced an id.ts translation module and integrated it into the main internationalization index, ensuring Indonesian content appeared consistently across user-facing privacy features. Using TypeScript and front-end development skills, Maruf established a scalable localization pattern that simplifies future language onboarding. His work enhanced accessibility and compliance for Indonesian users, reducing friction in privacy interactions. Although no bugs were fixed during this period, the engineering effort deepened the product’s localization infrastructure and improved the user experience for a broader audience.