12.0 change triangle icon (#6233)

* change main page

* change main panel icon to #666666

* change wiki icon

* change sort icons

* change hidden header table

* change style

frontend/src/components/popover/virtual-tag-color.js

@@ -63,7 +63,7 @@ export default class VirtualTagColor extends React.Component {
           style={{backgroundColor: tagColor}}
           onClick={this.togglePopover}
         >
-          <i className="fas fa-caret-down text-white"></i>
+          <i className="sf3-font sf3-font-down text-white"></i>
         </span>
         <Popover
           target={`tag-${id}-color`}