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---
name: i18n
description: Internationalization (i18n) and localization (l10n). Use when adding multi-language support.
---
## i18n
Implement internationalization.
### Setup
- Extract strings to translation files
- Use ICU message format
- Support pluralization
- Handle RTL languages
- Format dates/numbers per locale
### Best practices
- Never concatenate translated strings
- Translation keys as default messages
- Context comments for translators
- Test with pseudo-locale
- Lazy-load locale data
