In Jan 2026, delivered a localization-driven overhaul for the Spanish JavaScript documentation in the mdn/translated-content repo, achieving parity with the English version and improving readability, structure, and glossary alignment. Key outcomes include parity with the English structure (including subsections like Key Capabilities, Scope and Standards, Important Distinction), updated glossary/terminology, and updated links to Spanish sources; added localization metadata to support traceability of changes. Resolved CI lint issues by removing non-supported metadata fields and incorporating sourceCommit metadata, ensuring clean builds. Collaboration with co-author Juan Vásquez enhanced maintainability and governance of multilingual content. Technologies demonstrated include localization workflows, documentation modernization, ESLint/Prettier hygiene, and source-tracking for multilingual content. This work delivers business value through clearer documentation for Spanish-speaking users, reduced translation drift, and improved discoverability and support efficiency.