add support for zh_cn

worklenz-frontend/public/locales/zh/settings/sidebar.json

@@ -0,0 +1,14 @@
+{
+  "profile": "个人资料",
+  "notifications": "通知",
+  "clients": "客户",
+  "job-titles": "职位",
+  "labels": "标签",
+  "categories": "类别",
+  "project-templates": "项目模板",
+  "task-templates": "任务模板",
+  "team-members": "团队成员",
+  "teams": "团队",
+  "change-password": "更改密码",
+  "language-and-region": "语言和地区"
+}