ActionRow added to FollowUp (consistency). 'Back' dtl block wrapped around the ActionRow at the top so that the whole row is only shown when a 'Back' link is there. Unused div 'Clear' in MessageHeader removed (changed to absolute positioning instead of float).
ActionRow added to FollowUp (consistency). 'Back' dtl block wrapped around the ActionRow at the top so that the whole row is only shown when a 'Back' link is there. Unused div 'Clear' in MessageHeader removed (changed to absolute positioning instead of float).

otrs-xx/otrs,otrs-xx/otrs,otrs-xx/otrs,otrs-xx/otrs