Merge pull request #4567 from kubernetes/issue-langs

Adjustment titles of Chinese & English issue template titles

.github/ISSUE_TEMPLATE/__en-US.md

 ---
 name: English
-about: Report an issue in English
+about: Report an issue
 ---
 <!-- Please use this template while reporting an issue, providing as much information as possible. Failure to do so may result in a delayed response. Thank you! -->
 

.github/ISSUE_TEMPLATE/zh-CN.md

 ---
-name: 中文
+name: 中文 (Chinese)
 about: 报告问题
 labels: l/zh-CN
 ---