Change issue and PR templates to encourage contributors to use English

Author: wwbmmm

.github/ISSUE_TEMPLATE/bug_report.md

@@ -4,20 +4,20 @@ about: Create a report to help us improve
 
 ---
 
-**Describe the bug (描述bug)**
+**Describe the bug**
 
 
-**To Reproduce (复现方法)**
+**To Reproduce**
 
 
-**Expected behavior (期望行为)**
+**Expected behavior**
 
 
-**Versions (各种版本)**
+**Versions**
 OS:
 Compiler:
 brpc:
 protobuf:
 
-**Additional context/screenshots (更多上下文/截图)**
+**Additional context/screenshots**
 

.github/ISSUE_TEMPLATE/feature_request.md

@@ -4,14 +4,14 @@ about: Suggest an idea for this project
 
 ---
 
-**Is your feature request related to a problem? (你需要的功能是否与某个问题有关?)**
+**Is your feature request related to a problem?**
 
 
-**Describe the solution you'd like (描述你期望的解决方法)**
+**Describe the solution you'd like**
 
 
-**Describe alternatives you've considered (描述你想到的折衷方案)**
+**Describe alternatives you've considered**
 
 
-**Additional context/screenshots (更多上下文/截图)**
+**Additional context/screenshots**
 

.github/pull_request_template.md

@@ -9,12 +9,12 @@ Problem Summary:
 Changed:
 
 Side effects:
-- Performance effects(性能影响):
+- Performance effects:
 
-- Breaking backward compatibility(向后兼容性): 
+- Breaking backward compatibility: 
 
 ---
 ### Check List:
-- Please make sure your changes are compilable(请确保你的更改可以通过编译).
-- When providing us with a new feature, it is best to add related tests(如果你向我们增加一个新的功能, 请添加相关测试).
-- Please follow [Contributor Covenant Code of Conduct](https://github.com/apache/brpc/blob/master/CODE_OF_CONDUCT.md).(请遵循贡献者准则).
+- Please make sure your changes are compilable.
+- When providing us with a new feature, it is best to add related tests.
+- Please follow [Contributor Covenant Code of Conduct](https://github.com/apache/brpc/blob/master/CODE_OF_CONDUCT.md).