Fixes #2588: "My progress" and "Help" links should be hidden for WCH.
Fixes #2586: moved related content to below the content area.
Fixes #2585: Description is unreadable on PDF content view page
Fixes #2587: Moves download button to right-hand side of content panel.
Merge pull request #2606 from jamalex/2588

Fixes #2588: "My progress" and "Help" links should be hidden for WCH.