Navigation hierarchy for related session

When I am **n** level deep after going from related session of one video to another, there is no way of going back to **n-1** screen. Either I have to search the video or again manually go through from one related video to another.

Can't a back button like the Mac App Store be implemented here? Don't know if it will be appropriate for a Mac App.

~Also can a favourite mechanism be implemented for related sessions where I don't have to go to the detail page of a session to favourite it, just like I can do in the left side bar?~ request moved to #568