Bug 32073: Consistent classes for primary buttons: Circulation

Bug 32073: Consistent classes for primary buttons: Circulation

This patch makes changes the button markup in Circulation templates --
including offline circulation -- so that all submit buttons and any
buttons that should should be styled as primary buttons have the
Bootstrap class "btn btn-primary."

To test, apply the patch and view pages in Circulation to confirm
that everything looks correct. In most cases there are no visible
changes.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>