display cost_object correctly

git-svn-id: https://dev.finn.de/svn/cockpit/branches/reporting_merge@1382 7926756e-e54e-46e6-9721-ed318f58905e

app/helpers/reporting_helper.rb

@@ -52,6 +52,7 @@ module ReportingHelper
         when :tmonth                    then month_name(value.to_i)
         when :category_id               then IssueCategory.find(value.to_i).name
         when :cost_type_id              then CostType.find(value.to_i).name
+        when :cost_object               then CostObject.find(value.to_i).subject
         else "??? #{key}: #{value.inspect} ???"
         end
       end