chore: add 'auto-expand' translation in zh-Hans.json (#5326)

Author: taosin

web/src/locales/zh-Hans.json

@@ -21,6 +21,7 @@
     "archive": "归档",
     "archived": "已归档",
     "attachments": "附件",
+    "auto-expand": "自动展开",
     "avatar": "头像",
     "basic": "基础",
     "beta": "测试",