Intervention revocation

* adds Revocation model to interventions/models.py
* adds revocations to interventions detail view
* fixes duplicated ids in html includes
* refactors controls for detail view into included template files (controls.html)
* reduces max length for payment transfer notes from 1000 to 200
* adds RevocationAdmin to intervention/admin.py
* adds new form for adding a Revocation to an intervention's legal_data
  * only one revocation per intervention possible
  * removes add button in case of an existing revocation
* adds revocation routes to intervention app
* renames document field in Document model into file for more clarity
* adds/updates translations

konova/forms.py

@@ -300,7 +300,7 @@ class NewDocumentForm(BaseModalForm):
         self.form_caption = _("")
         self.template = "modal/modal_form.html"
         self.form_attrs = {
-            "enctype": "multipart/form-data",
+            "enctype": "multipart/form-data",  # important for file upload
         }
 
     def save(self):