Bug 32086: Consistent classes for primary buttons: Patrons

Bug 32086: Consistent classes for primary buttons: Patrons

This patch makes changes the button markup in patron
module 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 module pages 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>