webadmin: Fix the title in error pop ups

Adding the tile of error pop ups. It was empty
earlier.

Change-Id: I458ab8008b44d1e245e0ece345c5eca58112a3bd
Bug-Url: https://bugzilla.redhat.com/1024736
Signed-off-by: Ramesh Nachimuthu <rnachimu@redhat.com>