zh-trans: add certificate.md (#11238)

zh-trans: add certificate.md

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

@@ -0,0 +1,42 @@
+---
+title: 证书
+id: certificate
+date: 2018-04-12
+full_link: /docs/tasks/tls/managing-tls-in-a-cluster/
+short_description: >
+  证书是个安全加密文件，用来确认对 Kubernetes 集群访问的合法性。
+
+aka: 
+tags:
+- security
+---
+
+<!--
+---
+title: Certificate
+id: certificate
+date: 2018-04-12
+full_link: /docs/tasks/tls/managing-tls-in-a-cluster/
+short_description: >
+  A cryptographically secure file used to validate access to the Kubernetes cluster.
+
+aka: 
+tags:
+- security
+---
+-->
+
+<!--
+ A cryptographically secure file used to validate access to the Kubernetes cluster.
+-->
+
+证书是个安全加密文件，用来确认对 Kubernetes 集群访问的合法性。
+
+<!--more--> 
+
+<!--
+Certificates enable applications within a Kubernetes cluster to access the Kubernetes API securely. Certificates validate that clients are allowed to access the API.
+-->
+
+证书可以让 Kubernetes 集群中运行的应用程序安全的访问 Kubernetes API。证书可以确认客户端是否被允许访问 API。
+