[#1572] Chargement du champ vigilo_template en ajax

Change-Id: I2874cda44e4f06a0f5f5c6dc3c9081229f73627f
Reviewed-on: https://vigilo-dev.si.c-s.fr/review/2322
Reviewed-by: Francois POIROTTE <francois.poirotte@c-s.fr>
Tested-by: Francois POIROTTE <francois.poirotte@c-s.fr>