update issue template to emphasize English only

Signed-off-by: 周鹏飞@yunify <pengfeizhou@yunify.com>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -3,40 +3,39 @@ name: Bug report
 about: Create a report to help us improve
 ---
 
- 
+## English only!
+
+**注意！GitHub Issue 仅支持英文，中文 Issue 请在 [论坛](https://kubesphere.com.cn/forum/) 提交。**
+
 **General remarks**
 
 > Please delete this section including header before submitting
-> 也可以使用中文
 >
 > This form is to report bugs. For general usage questions refer to our Slack channel
 >        [KubeSphere-users](https://join.slack.com/t/kubesphere/shared_invite/enQtNTE3MDIxNzUxNzQ0LTdkNTc3OTdmNzdiODViZjViNTU5ZDY3M2I2MzY4MTI4OGZlOTJmMDg5ZTFiMDAwYzNlZDY5NjA0NzZlNDU5NmY)
 
-**Describe the bug(描述下问题)**
+**Describe the Bug**
 A clear and concise description of what the bug is.
 
 For UI issues please also add a screenshot that shows the issue.
 
-**Versions used(KubeSphere/Kubernetes的版本)**
+**Versions Used**
 KubeSphere:
 Kubernetes: (If KubeSphere installer used, you can skip this)
 
 
-**Environment(环境的硬件配置)**
-How many nodes and their hardware configuration: 
-
-For example:
-3 masters:  8cpu/8g
-3 nodes: 8cpu/16g
+**Environment**
+How many nodes and their hardware configuration:
 
+For example: CentOS 7.5 / 3 masters:  8cpu/8g; 3 nodes: 8cpu/16g
 (and other info are welcomed to help us debugging)
 
-**To Reproduce(复现步骤)**
+**How To Reproduce**
 Steps to reproduce the behavior:
 1. Go to '...'
 2. Click on '....'
 3. Scroll down to '....'
 4. See error
 
-**Expected behavior(预期行为)**
+**Expected behavior**
 A clear and concise description of what you expected to happen.