Initial frontend import

src/admin/useAdminT.ts

@@ -0,0 +1,7 @@
+import { useCallback } from "react";
+import { tLang } from "../i18n";
+
+/** Admin area always uses 繁體中文, independent of site language. */
+export function useAdminT() {
+  return useCallback((key: string) => tLang("zh-TW", key), []);
+}