i18n Localization Toolkit

Complete internationalization skill that teaches your agent how to add multi-language support to React, Next.js, Vue, and Svelte apps. Covers the full i18n lifecycle: auditing codebases for hardcoded strings, setting up next-intl or react-i18next, extracting translation keys, managing locale files, handling pluralization (including complex Arabic/Russian rules), RTL layout support with CSS logical properties, date/number/currency formatting, language switcher components, and CI validation scripts that catch missing translations before deploy. Includes ready-to-use bash scripts for string extraction and translation file validation, a GitHub Actions workflow, and a comprehensive new-language checklist. Saves hours of Stack Overflow searching and trial-and-error every time you need to internationalize a project.