Documents removing

* adds generic modal rendering using package django-bootstrap-modal-forms
* adds document file removing from hard drive
* adds translations

konova/models.py

@@ -5,6 +5,7 @@ Contact: michel.peltriaux@sgdnord.rlp.de
 Created on: 17.11.20
 
 """
+import os
 import uuid
 
 from django.contrib.auth.models import User
@@ -65,6 +66,19 @@ class Document(BaseResource):
     document = models.FileField()
     comment = models.TextField()
 
+    def delete(self, using=None, keep_parents=False):
+        """ Custom delete function to remove the real file from the hard drive
+
+        Args:
+            using ():
+            keep_parents ():
+
+        Returns:
+
+        """
+        os.remove(self.document.file.name)
+        super().delete(using=using, keep_parents=keep_parents)
+
 
 class Geometry(BaseResource):
     """