zh-trans: add istio.md (#11318)

为解决引入英文原文导致的冲突，重新创建PR #11270，已review。

content/zh/docs/reference/glossary/istio.md

@@ -3,6 +3,21 @@ title: Istio
 id: istio
 date: 2018-04-12
 full_link: https://istio.io/docs/concepts/what-is-istio/overview.html
+short_description: >
+  Istio 是个开放平台（非 Kubernetes 特有），提供了一种统一的方式来集成微服务、管理流量、实施策略和汇总度量数据。
+aka: 
+tags:
+- networking
+- architecture
+- extension
+---
+
+<!--
+---
+title: Istio
+id: istio
+date: 2018-04-12
+full_link: https://istio.io/docs/concepts/what-is-istio/overview.html
 short_description: >
   An open platform (not Kubernetes-specific) that provides a uniform way to integrate microservices, manage traffic flow, enforce policies, and aggregate telemetry data.
 
@@ -12,9 +27,19 @@ tags:
 - architecture
 - extension
 ---
+-->
+
+<!--
  An open platform (not Kubernetes-specific) that provides a uniform way to integrate microservices, manage traffic flow, enforce policies, and aggregate telemetry data.
+-->
+
+Istio 是个开放平台（非 Kubernetes 特有），提供了一种统一的方式来集成微服务、管理流量、实施策略和汇总度量数据。
 
 <!--more--> 
 
+<!--
 Adding Istio does not require changing application code. It is a layer of infrastructure between a service and the network, which when combined with service deployments, is commonly referred to as a service mesh. Istio's control plane abstracts away the underlying cluster management platform, which may be Kubernetes, Mesosphere, etc.
+-->
+
+添加 Istio 时不需要修改应用代码。它是基础设施的一层，介于服务和网络之间。当它和服务的 Deployment 相结合时，就构成了通常所谓的服务网格（Service Mesh）。Istio 的控制面抽象掉了底层的集群管理平台，这一集群管理平台可以是 Kubernetes、Mesosphere 等。