Update IntlProvider.tsx

Correct Vietnam flag

frontend/src/locale/IntlProvider.tsx

@@ -47,6 +47,7 @@ const getFlagCodeForLocale = (locale?: string) => {
 	const specialCases: Record<string, string> = {
 		ja: "jp", // Japan
 		zh: "cn", // China
+		vi: "vn, // Vietnam
 	};
 
 	if (specialCases[thisLocale]) {