zh_Trans: Fix preview issue (#11311)

* zh_trans: kubeadm-upgrade-1-12.md

* update file

* Update _index.md

* Delete _index.md

* Update kubeadm-upgrade-1-12.md

* zh_trans: docs/reference/setup-tools/kubeadm/generated/kubeadm_config.md

* Update kubeadm_config.md

* zh_trans: fix Preview

* zh_trans: fix Preview

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

@@ -0,0 +1,19 @@
+---
+title: Developer (disambiguation)
+id: developer
+date: 2018-04-12
+full_link: 
+short_description: >
+  May refer to: Application Developer, Code Contributor, or Platform Developer.
+
+aka: 
+tags:
+- community
+- user-type
+---
+ May refer to&#58; {{< glossary_tooltip text="Application Developer" term_id="application-developer" >}}, {{< glossary_tooltip text="Code Contributor" term_id="code-contributor" >}}, or {{< glossary_tooltip text="Platform Developer" term_id="platform-developer" >}}.
+
+<!--more--> 
+
+This overloaded term may have different meanings depending on the context
+