I18n Localization

Comes with a checker script that scans your codebase for untranslated text and missing locale files. The skill covers standard patterns for React, Next.js, and Python, plus RTL layout considerations and proper date/number formatting with the Intl API. Most useful when you're adding i18n to an existing codebase or auditing before a multi-language launch. The checklist and DO/DON'T sections are solid practical references, though you'll still need to choose and configure your actual i18n library.