When the user subscribes to a topic, a "green orb" is placed next to the topic title to indicate the subscription status, however, for forum subscriptions (all topics inside the forum), ther is no such cue, except the fact that the link for subscription/unsubscription says so, maybe automatically add the "green orb" to all topics in the forum if the user is subscribed to that forum or use a different "orb" color for that purpose