Add i18n for payment state key

+ update spec

lib/reporting/reports/payments/base.rb

@@ -15,7 +15,7 @@ module Reporting
         protected
 
         def payment_state(order)
-          order.payment_state
+          I18n.t "spree.payment_states.#{order.payment_state}"
         end
       end
     end

spec/system/admin/reports/payments_report_spec.rb

@@ -86,7 +86,7 @@ describe "Payments Reports" do
       ].join(" ").upcase)
 
       expect(page.find("table.report__table tbody tr").text).to have_content([
-        order.payment_state,
+        "credit owed",
         order.distributor.name,
         order.item_total.to_f + other_order.item_total.to_f,
         order.ship_total.to_f + other_order.ship_total.to_f,