add @icon to subscribe button

src/renderer/component/link/view.jsx

@@ -8,6 +8,7 @@ const Link = props => {
     style,
     label,
     icon,
+    iconRight,
     button,
     disabled,
     children,
@@ -36,8 +37,9 @@ const Link = props => {
   } else {
     content = (
       <span {...("button" in props ? { className: "button__content" } : {})}>
-        {"icon" in props ? <Icon icon={icon} fixed={true} /> : null}
+        {icon ? <Icon icon={icon} fixed={true} /> : null}
         {label ? <span className="link-label">{label}</span> : null}
+        {iconRight ? <Icon icon={iconRight} fixed={true} /> : null}
       </span>
     );
   }

src/renderer/component/subscribeButton/view.jsx

@@ -23,6 +23,7 @@ export default ({
   return channelName && uri ? (
     <div className="card__actions">
       <Link
+        iconRight={isSubscribed ? "" : "at"}
         button={isSubscribed ? "alt" : "primary"}
         label={subscriptionLabel}
         onClick={() => subscriptionHandler({