diff --git a/gui/scripts/i18n-backend.ts b/gui/scripts/i18n-backend.ts
index df69cef..c5c36b8 100644
--- a/gui/scripts/i18n-backend.ts
+++ b/gui/scripts/i18n-backend.ts
@@ -6,33 +6,52 @@ const __dirname = path.dirname(path.fromFileUrl(import.meta.url));
 const app = new Application();
 const router = new Router();
 
-router.post('/locales/add/:lng/:ns', async (context) => {
-  try {
-    // ns is ignored
-    const { lng } = context.params;
-    const body: Record<string,string> = await context.request.body({ type: 'json' }).value;
-    const keys = Object.keys(body);
+const keys: Set<string> = new Set();
 
+async function updateFile() {
+  delayId = null;
+  for (const lng of ['en', 'zh-CN']) {
     const translationPath = path.join(__dirname, `../src/i18n/translation/${lng}.json`);
 
     let translations: Record<string, string> = {};
     try {
       translations = JSON.parse(await Deno.readTextFile(translationPath));
     } catch (error) {}
+    const toAdd = [...keys].filter(k => !Object.keys(translations).includes(k));
 
     translations = Object.fromEntries(
-      [...Object.entries(translations), ...keys.map(i => [i, i] as const)].sort(([a], [b]) => a.localeCompare(b)),
+      [
+        ...Object.entries(translations),
+        ...toAdd
+          .map(i => [i, i] as const)]
+          .sort(([a], [b]) => a.localeCompare(b)),
     );
+    console.log('Add keys:', toAdd, 'for', lng);
 
     await Deno.writeTextFile(
       translationPath,
       JSON.stringify(translations, null, 2),
     );
+  }
+  keys.clear();
+}
+let delayId: number|null = null;
 
-    console.log('Add keys:', keys);
+router.post('/locales/add/:lng/:ns', async (context) => {
+  try {
+    // ns, lng is ignored
+    const body: Record<string,string> = await context.request.body({ type: 'json' }).value;
+    for (const key of Object.keys(body)) {
+      keys.add(key);
+    }
+
+    if (delayId !== null) {
+      clearTimeout(delayId);
+    }
+    delayId = setTimeout(updateFile, 1000);
 
     context.response.status = 200;
-    context.response.body = { message: 'Translation updated.' };
+    context.response.body = { message: 'Translation added.' };
   } catch (error) {
     context.response.status = 500;
     context.response.body = { message: error.message };
diff --git a/gui/src/i18n/config.ts b/gui/src/i18n/config.ts
index bc4663f..e574100 100644
--- a/gui/src/i18n/config.ts
+++ b/gui/src/i18n/config.ts
@@ -1,12 +1,16 @@
 import i18next from 'i18next';
 import LanguageDetector from 'i18next-browser-languagedetector';
 import { initReactI18next } from 'react-i18next';
-import translation from './translation/en.json';
+import en from './translation/en.json';
+import zhCN from './translation/zh-CN.json';
 import HttpBackend from 'i18next-http-backend'
 
 export const resources = {
   en: {
-    translation,
+    translation: en,
+  },
+  'zh-CN': {
+    translation: zhCN,
   }
 };
 
@@ -21,6 +25,5 @@ if (import.meta.env.DEV) {
 instance.init({
   debug: import.meta.env.DEV,
   resources,
-  saveMissing: true,
-  fallbackLng: 'en'
+  // saveMissing: true,
 });
diff --git a/gui/src/i18n/translation/en.json b/gui/src/i18n/translation/en.json
index 30a2bf7..9e26dfe 100644
--- a/gui/src/i18n/translation/en.json
+++ b/gui/src/i18n/translation/en.json
@@ -1,7 +1 @@
-{
-  "title": "Welcome {{name}}, to react using react-i18next fully type-safe",
-  "description": {
-    "part1": "This is a simple example.",
-    "part2": "😉"
-  }
-}
\ No newline at end of file
+{}
\ No newline at end of file
diff --git a/gui/src/i18n/translation/zh-CN.json b/gui/src/i18n/translation/zh-CN.json
new file mode 100644
index 0000000..9e26dfe
--- /dev/null
+++ b/gui/src/i18n/translation/zh-CN.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file