Removed bold style from action button.

The spec defines the action button to be Roboto Medium, however "bold" is
heavier than Roboto Medium for API < 21. Therefore the action button should just
be regular on API < 21.
Fixed the min/max width and offset for the tablet layout.
Merge branch 'feature/action_style_fix' into develop
Merge branch 'feature/tablet_layout_fix' into develop