When the Chrome browser is set to Simplified Chinese, the `Accept-Language` will be set as follows:
```

zh,zh-CN;q=0.9,en;q=0.8,zh-TW;q=0.7
```
 
If help file only has default and zh_CN, the two version
like
```
help-name.html
help-name_zh_CN.html
```

At this moment, we obviously hope to obtain the zh_CN version of the help text.
But in reality, it returned the English version.