fix: set language code before initializing checkout

src/components/layout/Header.tsx

@@ -55,16 +55,14 @@ export default function Header({ locale: propLocale = "sr" }: HeaderProps) {
     setLangDropdownOpen(false);
   };
 
-  useEffect(() => {
-    initCheckout();
-  }, [initCheckout]);
-
-  // Set language code for checkout based on current locale
+  // Set language code first, then initialize checkout
   useEffect(() => {
     if (locale) {
       setLanguageCode(locale);
+      // Initialize checkout after language code is set
+      initCheckout();
     }
-  }, [locale, setLanguageCode]);
+  }, [locale, setLanguageCode, initCheckout]);
 
   useEffect(() => {
     const handleScroll = () => {