webadmin: Fix remove bricks error message

Changed the hash name to not to append the default
remove message template.
Fixed the typos.

Bug-Url: https://bugzilla.redhat.com/905873
Bug-Url: https://bugzilla.redhat.com/905881
Change-Id: Ie4923746fbc9487eab47b7b1b3d995637641e777
Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>