use select2 for emailrecipients in device mail modal
use select2 for emailrecipients in device mail modal

fixes #302

MPIB/Lagerregal,MPIB/Lagerregal,vIiRuS/Lagerregal,MPIB/Lagerregal,vIiRuS/Lagerregal,vIiRuS/Lagerregal