fix: update I18nProvider prop from initialLocale to locale

src/app/[lang]/preview-upload/page.tsx

@@ -36,7 +36,7 @@ export default function PreviewUploadPage() {
   );
 
   return (
-    <I18nProvider initialLocale="en">
+    <I18nProvider locale="en">
       <QuestionAnswersProvider initialAnswers={initialAnswers}>
         <div className="mx-auto flex min-h-screen max-w-[430px] flex-col bg-[#FFF7F7] px-4 py-3 font-sans antialiased text-[#111111]">
           {/* Top Bar */}