Update zh-CN translation for setting module.

src/languages/zh-CN.js

@@ -23,6 +23,7 @@ export default {
     Theme: "主题",
     General: "基本设置",
     "Primary Base URL": "站点地址（URL）",
+    About: "关于",
     Version: "版本",
     "Check Update On GitHub": "检查更新",
     List: "列表",
@@ -150,6 +151,7 @@ export default {
     importHandleDescription: "如果想跳过同名的监控项或通知，请选择“跳过”；“覆盖”将删除所有现有的监控项和通知。",
     confirmImportMsg: "确定要导入备份吗？请确保已经选择了正确的导入选项。",
     "Heartbeat Retry Interval": "心跳重试间隔",
+    "Backup": "备份",
     "Import Backup": "导入备份",
     "Export Backup": "导出备份",
     "Skip existing": "跳过",