feat(ui): optimize table UI

ui/src/i18n/locales/zh/nls.workflow.json

@@ -1,8 +1,12 @@
 {
   "workflow.page.title": "工作流",
+
+  "certificate.nodata": "暂无证书，创建一个工作流去生成证书吧～ 😀",
+
+  "workflow.nodata": "No workflows yet. Try to create a workflow to generate certificates! 😀",
+
   "workflow.detail.title": "流程",
   "workflow.detail.history": "历史",
-
   "workflow.detail.action.save": "保存变更",
   "workflow.detail.action.save.failed": "保存失败",
   "workflow.detail.action.save.failed.uncompleted": "保存失败，请完成所有节点设置",