Switch language name 'zh' to 'zh-cn'

This is the first step to rename 'zh' to 'zh-cn'. There are several reasons why we rename the language name.

- The upstream docsy theme changed the language name, leading to many warnings during site build;
  The side-effect is that the i18n strings are no longer working.
- We believe renaming the language is the right thing to do, because this move can make room for other variants of Chinese language, such as 'zh-tw', 'zh-sg' etc.

There would be several follow-ups to this PR, such as fixing the intra-site links, adding redirects etc.

We will lock up changes to zh/zh-cn pages for the moment, until this one gets in.

This PR is based on commit cdad0a7342.

content/zh-cn/docs/reference/kubernetes-api/common-definitions/local-object-reference.md

@@ -0,0 +1,46 @@
+---
+api_metadata:
+  apiVersion: ""
+  import: "k8s.io/api/core/v1"
+  kind: "LocalObjectReference"
+content_type: "api_reference"
+description: "LocalObjectReference 包含足够的信息，可以让你在同一命名空间内找到引用的对象。"
+title: "LocalObjectReference"
+weight: 4
+auto_generated: true
+---
+
+<!--
+api_metadata:
+  apiVersion: ""
+  import: "k8s.io/api/core/v1"
+  kind: "LocalObjectReference"
+content_type: "api_reference"
+description: "LocalObjectReference contains enough information to let you locate the referenced object inside the same namespace."
+title: "LocalObjectReference"
+weight: 4
+auto_generated: true
+-->
+
+`import "k8s.io/api/core/v1"`
+
+<!--
+LocalObjectReference contains enough information to let you locate the referenced object inside the same namespace.
+-->
+LocalObjectReference 包含足够的信息，可以让你在同一命名空间（namespace）内找到引用的对象。
+
+<hr>
+
+<!--
+- **name** (string)
+
+  Name of the referent. More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#names
+-->
+- **name** (string)
+
+  被引用者的名称。
+  更多信息: https://kubernetes.io/zh/docs/concepts/overview/working-with-objects/names/#names。
+
+
+
+