feat: align frontend languages with posts api

src/components/messageStream/utils/formatTime.ts

@@ -1,7 +1,14 @@
 function localeFor(lang: string): string {
-  if (lang === "zh-TW") return "zh-TW";
-  if (lang === "zh-CN") return "zh-CN";
-  return "en-US";
+  const locales: Record<string, string> = {
+    zh: "zh-CN",
+    en: "en-US",
+    ja: "ja-JP",
+    ko: "ko-KR",
+    vi: "vi-VN",
+    id: "id-ID",
+    ms: "ms-MY",
+  };
+  return locales[lang] ?? "en-US";
 }
 
 function formatDate(iso: string, lang: string): string {