Fully hooked the Deliverable columns into the filters and Queries

* The Deliverable subject can now be filtered on the issues list
* The Deliverable subject can now be displayed on the issues lists with
  as a default column or part of a saved query
* The issues can be sorted by the deliverable

  #1148

lang/en.yml

@@ -8,3 +8,4 @@ field_fixed_cost: Fixed Bid
 field_project_manager_signoff: Project Manager Signoff
 field_client_signoff: Client Signoff
 field_deliverable: Deliverable
+field_deliverable_subject: Deliverable