Bug 32088: Consistent classes for primary buttons: Patron card creator

Bug 32088: Consistent classes for primary buttons: Patron card creator

This patch makes changes the button markup in patron card creator
templates 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 patron card creator pages to confirm
that everything looks correct. In most cases there are no visible
changes.

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