Bug 36207: (RM follow-up) CSRF correction

Bug 36207: (RM follow-up) CSRF correction

I think there was a rebase issue here where we split the form into two
forms instead of one.  This patch returns us to one form with two
different submit options (one for selected tags and one per tag) that
both trigger the confirmation modal before submitting to the controller.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 0ac23a624735c222bf9358d37961e6c49c21c579)
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>