webadmin: fix typo in Add-Bricks popup

"create" -> "created".

Change-Id: I36c3022a6d6189a751f0c83d1c0c1159d8a25923
Bug-Url: https://bugzilla.redhat.com/886478
Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>