Created src/lib/i18n/locales.ts as single source of truth for:
- SUPPORTED_LOCALES array
- LOCALE_COOKIE name
- DEFAULT_LOCALE
- LOCALE_CONFIG (labels, flags, Saleor locale mapping)
- Helper functions (isValidLocale, getSaleorLocale, getLocaleFromPath)
Updated all files to use centralized constants:
- middleware.ts
- Header.tsx
- ProductCard.tsx
- sitemap.ts
- root layout and locale layout
- routing.ts
Benefits:
- Adding new locale only requires updating ONE file (locales.ts)
- No more hardcoded locale lists scattered across codebase
- Cookie name defined in one place
- Type-safe locale validation
Changes:
- Root page.tsx now detects browser language (Accept-Language header)
and cookie preference to redirect to correct locale (/sr or /en)
- Middleware handles old Serbian URLs (/products, /about, etc.) with
301 redirects to /sr/* while respecting locale cookie
- Header component now includes language switcher dropdown with
flag icons (Serbian and English)
- Language selection sets NEXT_LOCALE cookie and persists preference
Behavior:
- User visits / → redirects to /sr or /en based on cookie/browser
- User selects English from dropdown → cookie set, redirects to /en/*
- User visits /products with en cookie → /en/products (301)
- User visits /products with sr/no cookie → /sr/products (301)
- Root / now uses next-intl locale detection to redirect based on
Accept-Language header (English browser → /en, Serbian → /sr, etc.)
- Old Serbian URLs (/products, /about, etc.) still redirect to /sr/* with 301
- English URLs (/en/*) remain unchanged
Redirect old Serbian URLs (without /sr/ prefix) to new /sr/ URLs:
- / → /sr (301)
- /products → /sr/products (301)
- /about → /sr/about (301)
- /contact → /sr/contact (301)
- /checkout → /sr/checkout (301)
English URLs (/en/*) remain unchanged. This preserves SEO value
as Google treats 301 as permanent redirect passing ~90-99% PageRank.
WARNING: This change breaks existing SEO URLs for Serbian locale.
Changes:
- Migrated from separate locale folders (src/app/en/, src/app/de/, etc.)
to [locale] dynamic segments (src/app/[locale]/)
- Serbian is now at /sr/ instead of / (root)
- English at /en/, German at /de/, French at /fr/
- All components updated to generate locale-aware links
- Root / now redirects to /sr (307 temporary redirect)
SEO Impact:
- Previously indexed Serbian URLs (/, /products, /about, /contact)
will now return 404 or redirect to /sr/* URLs
- This is a breaking change for SEO - Serbian pages should ideally
remain at root (/) with only non-default locales getting prefix
- Consider implementing 301 redirects from old URLs to maintain
search engine rankings
Technical Notes:
- next-intl v4 with [locale] structure requires ALL locales to
have the prefix (cannot have default locale at root)
- Alternative approach would be separate folder structure per locale
- Add middleware.ts for locale detection (URL path, cookie, Accept-Language)
- Update routing.ts to include en, de, fr locales
- Update layout.tsx with NextIntlClientProvider and dynamic lang attribute
- Create EN/DE/FR homepages, product listings, product details, about, and contact pages
- Serbian remains at root URL (/products, /about, /contact)
- English at /en/*, German at /de/*, French at /fr/*
