restapi : error translation is broken (#987848)

backend error translation is broken

Actual results:

[var  action  run, var  type  vm, vm cannot ...]

Expected results:

translated error according to apperrors properties

Change-Id: I365e02c03ef7c8412fdf634e41e7d8ad61b0d804
Bug-Url: https://bugzilla.redhat.com/987848
Signed-off-by: Ravi Nori <rnori@redhat.com>