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

intervention/models.py

@@ -12,7 +12,7 @@ from django.utils import timezone
 from django.utils.timezone import now
 
 from intervention.settings import INTERVENTION_IDENTIFIER_LENGTH, INTERVENTION_IDENTIFIER_TEMPLATE
-from konova.models import BaseObject, Geometry, UuidModel
+from konova.models import BaseObject, Geometry, UuidModel, BaseResource
 from konova.utils import generators
 from konova.utils.generators import generate_random_string
 from organisation.models import Organisation
@@ -38,6 +38,20 @@ class ResponsibilityData(UuidModel):
         )
 
 
+class Revocation(BaseResource):
+    """
+    Holds revocation data e.g. for intervention objects
+    """
+    date = models.DateField(null=True, blank=True, help_text="Revocation from")
+    comment = models.TextField(null=True, blank=True)
+    document = models.ForeignKey("konova.Document", blank=True, null=True, on_delete=models.SET_NULL)
+
+    def delete(self):
+        # Make sure related objects are being removed as well
+        self.document.delete()
+        super().delete()
+
+
 class LegalData(UuidModel):
     """
     Holds intervention legal data such as important dates, laws or responsible handler
@@ -51,6 +65,8 @@ class LegalData(UuidModel):
     process_type = models.CharField(max_length=500, null=True, blank=True)
     law = models.CharField(max_length=500, null=True, blank=True)
 
+    revocation = models.ForeignKey(Revocation, null=True, blank=True, help_text="Refers to 'Widerspruch am'", on_delete=models.SET_NULL)
+
     def __str__(self):
         return "{} | {} | {}".format(
             self.process_type,