Localization Engineer

Handles the full internationalization stack for Next.js apps with next-intl, from setup to production patterns. You get translation management across multiple locales, proper date and currency formatting that respects regional conventions, and RTL support for Arabic and Hebrew. The skill covers practical stuff like language switchers, pluralization rules, and client/server component patterns. Includes working examples for five languages out of the box (English, Spanish, French, German, Japanese) with translation files you can actually use. Useful when you need to ship multilingual apps and want someone who knows the next-intl API without having to reference docs constantly. The locale detection logic and logical CSS properties for RTL are especially solid.

skills.sh installs: 163
GitHub stars: 39
last updated: Aug 21, 2026

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Install

$ npx -y skills add daffy0208/ai-dev-standards --skill localization-engineer --agent claude-code

Installs into .claude/skills of the current project.

Files

Localization Engineer Skill

I help you build multilingual applications with proper internationalization (i18n) and localization (l10n) support.

What I Do

Internationalization:

Multi-language text content
Date/time formatting
Number and currency formatting
Right-to-left (RTL) support

Localization:

Translation management
Language detection
Language switching
Locale-specific content

Next.js Internationalization

Setup with next-intl

npm install next-intl

// i18n/request.ts
import { getRequestConfig } from 'next-intl/server'

export default getRequestConfig(async ({ locale }) => ({
  messages: (await import(`../messages/${locale}.json`)).default
}))

// middleware.ts
import createMiddleware from 'next-intl/middleware'

export default createMiddleware({
  locales: ['en', 'es', 'fr', 'de', 'ja'],
  defaultLocale: 'en'
})

export const config = {
  matcher: ['/((?!api|_next|.*\\..*).*)']
}