diff --git a/routes/_middleware.ts b/routes/_middleware.ts
index 7a948fc..2af4b43 100644
--- a/routes/_middleware.ts
+++ b/routes/_middleware.ts
@@ -7,6 +7,7 @@ import {
 import { exists } from "std/fs/exists.ts";
 import { get_task_manager } from "../server.ts";
 import { build_sw } from "../server/build_sw.ts";
+import { i18n_get_lang } from "../server/i18ns.ts";
 
 const STATIC_FILES = ["/common.css", "/scrollBar.css", "/sw.js", "/sw.js.map"];
 
@@ -49,6 +50,15 @@ export async function handler(req: Request, ctx: FreshContext) {
         if (!(await exists(p)) || p === flutter_base) {
             p = join(flutter_base, "/index.html");
         }
+        if (u.pathname == "/flutter/manifest.json") {
+            const lang = i18n_get_lang(req, ["zh-cn"]);
+            if (lang !== "en") {
+                const tp = join(flutter_base, `/manifest.${lang}.json`);
+                if (await exists(tp)) {
+                    p = tp;
+                }
+            }
+        }
         const opts: GetFileResponseOptions = {};
         opts.range = req.headers.get("range");
         opts.if_modified_since = req.headers.get("If-Modified-Since");
diff --git a/server/i18ns.ts b/server/i18ns.ts
index 2312bc8..00ddc61 100644
--- a/server/i18ns.ts
+++ b/server/i18ns.ts
@@ -54,6 +54,20 @@ export function get_i18nmap(lang: string, ...modules: MODULE[]) {
     return r;
 }
 
+export function i18n_get_lang(req: Request, langs: string[]) {
+    const u = new URL(req.url);
+    const lang = u.searchParams.get("lang");
+    if (lang && (lang === "en" || langs.includes(lang))) {
+        return lang;
+    } else {
+        const a = req.headers.get("Accept-Language");
+        const l =
+            (a ? pick(langs, a) || pick(langs, a, { loose: true }) : null) ||
+            "en";
+        return l;
+    }
+}
+
 export function i18n_handle_request(req: Request) {
     const u = new URL(req.url);
     const lang = u.searchParams.get("lang");