Say unassigned instead of WIP for merge requests since it might not fit everyones workflow.

app/views/projects/merge_requests/_merge_request.html.haml

@@ -18,7 +18,7 @@
     - if merge_request.assignee
       assigned to #{link_to_member(merge_request.source_project, merge_request.assignee)}
     - else
-      Work In Progress
+      Unassigned
     - if merge_request.votes_count > 0
       = render 'votes/votes_inline', votable: merge_request
     - if merge_request.notes.any?