Worked on the atlanhq/i18n repository to enhance localization infrastructure by implementing a new formatFallbackMessages option within the createI18nInstance function. This addition allowed for more flexible formatting of fallback messages, directly supporting internationalization needs and improving UI consistency. Addressed gaps in translation coverage by identifying and adding missing i18n keys throughout the codebase, reducing the risk of untranslated interface elements and streamlining future localization efforts. The work was carried out using TypeScript and JSON, with a focus on code clarity and maintainability. Each change was delivered through targeted, traceable commits that prioritized business value and localization readiness.