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

* Preliminary translation of the mixer.md document

* update mixer.md

update end period

istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io,istio/istio.io