Set context on Report.execute

Setting the context on Report._get_records does not work because the records
are not actually instantiated on the call but later so the context is lost.

issue7031
review36931002

invoice.py

@@ -2360,19 +2360,15 @@ class InvoiceReport(Report):
     def execute(cls, ids, data):
         pool = Pool()
         Invoice = pool.get('account.invoice')
-        result = super(InvoiceReport, cls).execute(ids, data)
-        if len(ids) == 1:
-            invoice, = Invoice.browse(ids)
-            if invoice.number:
-                result = result[:3] + (result[3] + ' - ' + invoice.number,)
-        return result
-
-    @classmethod
-    def _get_records(cls, ids, model, data):
         with Transaction().set_context(
                 language=False,
                 address_with_party=True):
-            return super(InvoiceReport, cls)._get_records(ids, model, data)
+            result = super(InvoiceReport, cls).execute(ids, data)
+            if len(ids) == 1:
+                invoice, = Invoice.browse(ids)
+                if invoice.number:
+                    result = result[:3] + (result[3] + ' - ' + invoice.number,)
+            return result
 
     @classmethod
     def get_context(cls, records, data):