[Icon] Wechat icon doesn't display

### Wechat icon doesn't display
Wechat icon should be with 'brand-icons' font-family.

### Steps
Add "wechat" icon to page

### Expected Result
Wechat icon

### Actual Result
No symbol in base font

### Version
2.3.1

### Testcase
https://jsfiddle.net/L96rdkwg/
