Correct menu hook for Spree v3.0.0.beta
Controller is not a decorator.
Update admin settings layout for Bootstrap.
Change font_scale option to font_size.

Font scale made no sense for Prawn where fonts not in em but in px. Set
reasonable range from 7px to 14px.
Move print buttons into order tabs.

Filling title space with buttons will break layout quick. Using
Glyphicon ‘save-file’ would look nicer but current Spree version of
Bootstrap do not have that one.