#86 Edit payment

* adds button for payment editing
* adds new edit form payment editing
* adds tests for views and workflow

konova/utils/message_templates.py

@@ -46,6 +46,7 @@ DEADLINE_REMOVED = _("Deadline removed")
 
 # PAYMENTS
 PAYMENT_ADDED = _("Payment added")
+PAYMENT_EDITED = _("Payment edited")
 PAYMENT_REMOVED = _("Payment removed")
 
 # REVOCATIONS