webadmin: Rename Gluster Hosts to Hosts in detach host dialog

renaming the detach host dialog title from 'Gluster Hosts' to
'Hosts'

Change-Id: If4576c48d2688d46721317d41ee55ec2b6f61121
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1024609
Signed-off-by: Ramesh Nachimuthu <rnachimu@redhat.com>