#232 Payment document linkage

* adds error message on intervention view if a payment has been added but no document has been uploaded yet
* adds same check to quality checker, meaning no intervention can be recorded which has a payment but no document
* adds trigger for sending data to egon on uploading a document in case of an already existing payment
* adds translations

intervention/forms/modals/document.py

@@ -10,4 +10,23 @@ from konova.forms.modals import NewDocumentModalForm
 
 
 class NewInterventionDocumentModalForm(NewDocumentModalForm):
-    document_model = InterventionDocument
+    document_model = InterventionDocument
+
+    def save(self, *args, **kwargs):
+        """ Extension of regular NewDocumentModalForm
+
+        Checks whether payments exist on the intervention and sends the data to EGON
+
+        Args:
+            *args ():
+            **kwargs ():
+
+        Returns:
+
+        """
+        doc = super().save(*args, **kwargs)
+
+        if self.instance.payments.exists():
+            self.instance.send_data_to_egon()
+
+        return doc