Developed a UI translation compliance tool for the formatjs/formatjs repository by implementing an ESLint rule that detects literal strings in object properties such as 'label', addressing the risk of untranslated UI text. The solution leveraged JavaScript and TypeScript to create the 'no-literal-string-in-object' rule, which integrates into existing code review workflows to flag localization gaps early. Automated tests were written to ensure reliability, and comprehensive documentation was provided to support adoption by development teams. This work strengthened localization practices by enforcing translation requirements at the linting stage, helping teams maintain consistent internationalization standards across their Vue.js and JavaScript codebases.