fix: 修复默认语言

Author: XYShaoKang

public/_locales/zh/messages.json public/_locales/zh_CN/messages.jsonpublic/_locales/zh/messages.json renamed to public/_locales/zh_CN/messages.json

@@ -4,7 +4,7 @@
   "version": "0.2.1",
   "manifest_version": 3,
   "homepage_url": "https://github.com/XYShaoKang/refined-leetcode",
-  "default_locale": "zh",
+  "default_locale": "zh_CN",
   "icons": {
     "16": "icons/icon-16.png",
     "48": "icons/icon-48.png",

public/manifest-dev.json

@@ -4,7 +4,7 @@
   "version": "0.0.0",
   "manifest_version": 3,
   "homepage_url": "https://github.com/XYShaoKang/refined-leetcode",
-  "default_locale": "zh",
+  "default_locale": "zh_CN",
   "icons": {
     "16": "icons/icon-16.png",
     "48": "icons/icon-48.png",