Can not unsubscribe from a forum you just subscribed

When you subscribe to a forum, the link name is changed to "Unsubscribe forum". However the link itself is not changed, so when you click it, it just turns on the black layer for a short moment and nothing happens.

Also the icon is not changed. (Btw this only happens when you dont click the link in the displayed layer)

Maybe we should just define both links and change the display, rather than the name