zh-translation: /docs/reference/glossary/mixer.md (#5454)

* Preliminary translation of the mixer.md document

* update mixer.md

update end period

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

@@ -1,7 +1,5 @@
 ---
 title: Mixer
 ---
-
-The Istio component is responsible for enforcing access control and usage policies across the [service mesh](#service-mesh) and collecting telemetry data
-from [Envoy](#envoy) and other services.
-[Learn more about Mixer](/docs/reference/config/policy-and-telemetry/).
+Mixer 是 Istio 里的一个组件，它负责增强[服务网格](#service-mesh)里的访问控制和使用策略。它还负责收集来自 [envoy](#envoy) 和其他服务的遥测数据。
+[了解更多关于 Mixer](/zh/docs/reference/config/policy-and-telemetry)。