feat: implement i18n for product and category, add 5 new locales

apps/spa/src/pages/ShopPage.tsx

@@ -211,7 +211,7 @@ export default function ShopPage() {
                   : 'bg-white text-spa-stone border-spa-stone/20 hover:border-spa-forest hover:text-spa-forest shadow-sm'
               }`}
             >
-              {cat.name}
+              {typeof cat.name === 'string' ? cat.name : (cat.name as any)?.[i18n.language] || (cat.name as any)?.en || ''}
               {cat._count && (
                 <span className={`ml-2 ${activeCategory === cat.id ? 'opacity-80' : 'opacity-60'}`}>({cat._count.products})</span>
               )}