On LHS, 'Add or Edit' Button should be 'Add or Remove' with other button staying the same i.e. 'Edit this chapter/event/entry'
This avoids use of 'Edit' twice close together which confuses. Whilst we will still allow user to edit as an option *after* selecting 'Add or Remove', they will normally choose the 'Edit this chapter/event/entry' optio in the first place if they wish to do this.
On RHS, all ok to stay the same [as we only give one button so Add or Edit is correct] - do you think should change button to 'Edit Links' (or Media Links) and 'Media Settings' (or keep just 'Settings')