Add support text to user-following interface.

Author: barraponto

lib/site-positions-component.js

@@ -46,14 +46,16 @@ class SitePositionsComponent {
     const {login} = portal.getSiteIdentity(siteId)
     const color = this.isCursorVisibleForSite(siteId) ? `color--site-${siteId}` : ''
     const location = this.getLocationForSite(siteId)
+    const following = portal.getFollowedSiteId() === siteId
     const onClick = (location === 'viewing-non-portal-item')
       ? () => {}
       : () => this.onSelectSiteId(siteId)
 
     return $.div({className: `SitePositionsComponent-site site-${siteId} ${location} ${color}`},
-      (portal.getFollowedSiteId() === siteId) ? $.div({className: 'icon icon-link'}) : null,
+      (following) ? $.div({className: 'icon icon-link'}) : null,
       $.img({
         src: getAvatarURL(login, 80),
+        title: `Click to ${following ? 'stop' : 'start'} following this user.`,
         onClick
       })
     )