Astro i18n Skill Skill | Agent Skills

Astro i18n Skill

Purpose

Provides internationalization patterns for lead generation sites targeting multiple markets/languages. Implements URL-based routing (/en/, /de/, /fr/), translation management, SEO optimization with hreflang tags, and RTL support.

Core Rules

URL structure first — /en/, /de/, /fr/ prefixes for SEO and user clarity
Fallback gracefully — Missing translations default to primary language with console warning
hreflang tags — Required on every page for proper language alternates
RTL support — Use logical CSS properties (margin-inline-start) for Arabic/Hebrew
Persist preference — Store user's language choice in localStorage/cookie
Type-safe translations — Use TypeScript for language codes and translation keys
No hardcoded text — All user-facing strings must come from translation files
SEO metadata — Translate title, description, og:locale for each language
Content parity — Each language should have equivalent content structure
Intl API formatting — Use native Intl for dates, numbers, currency per locale

Implementation Overview

| Component | Purpose | Location | |-----------|---------|----------| | languages config | Define supported locales + metadata | src/i18n/config.ts | | Translation files | JSON with nested keys | src/i18n/translations/{lang}.json | | t() function | Translation with fallback + params | src/i18n/utils.ts | | [lang]/ routes | Dynamic URL segments | src/pages/[lang]/ | | Language switcher | Dropdown component | Component in layout | | hreflang tags | SEO language alternates | <head> in BaseLayout | | Middleware | Optional browser detection | src/middleware.ts |

Quick Start

Minimal Config

// src/i18n/config.ts
export const languages = {
  en: { name: 'English', code: 'en-GB', dir: 'ltr' },
  de: { name: 'Deutsch', code: 'de-DE', dir: 'ltr' },
} as const;
export const defaultLang = 'en';
export type Lang = keyof typeof languages;

Translation Usage

---
import { t } from '@/i18n/utils';
const lang = getLangFromUrl(Astro.url);
---
<h1>{t(lang, 'hero.title')}</h1>
<p>{t(lang, 'hero.subtitle')}</p>
<button>{t(lang, 'hero.cta')}</button>

Dynamic Route

---
// src/pages/[lang]/index.astro
export function getStaticPaths() {
  return Object.keys(languages).map(lang => ({ params: { lang } }));
}
---

References

Configuration & Setup:

config.md - Language config, translation files, utilities

Routing & URLs:

routing.md - Dynamic routes, redirects, middleware

Components:

components.md - Base layout, language switcher

Content & Collections:

content-collections.md - Multi-language blog posts

Formatting:

formatters.md - Numbers, dates, currency per locale

RTL Support:

rtl-support.md - Arabic/Hebrew layout support

SEO:

seo.md - hreflang, Open Graph, sitemaps

Forbidden

❌ Hardcoded text in components (use t() function)
❌ Missing hreflang tags on pages
❌ Auto-translating without human review
❌ Different URLs for same content without hreflang links
❌ Ignoring RTL requirements for Arabic/Hebrew
❌ Locale in query params (?lang=de) instead of path (/de/)
❌ Using left/right CSS instead of logical properties
❌ Forgetting to translate meta descriptions and titles

Definition of Done

[ ] Language config with all supported locales defined
[ ] Translation JSON files for each language with complete key coverage
[ ] t() utility function with fallback to default language
[ ] URL-based language routing using [lang]/ dynamic segments
[ ] hreflang tags on all pages pointing to language alternates
[ ] Language switcher component in navigation
[ ] Root / redirects to default language
[ ] Browser language detection (optional, via middleware)
[ ] RTL support implemented if targeting Arabic/Hebrew
[ ] Date/number/currency formatting per locale using Intl API
[ ] Content collections with language-specific entries
[ ] All user-facing text extracted to translation files
[ ] SEO meta tags translated (title, description, og:locale)

Agent Skills: Astro i18n Skill

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