EMA

* fixes created timestamp in detail views where modified needs to be displayed
* adds fallback timestamp if data has not been edited, yet --> show created timestamp
* fixes bug where deleting of certain data didn't redirect to the index view
* adds quality_check() method for EMA, needed for recording
* adds all functions which are provided for compensations to EMA
* adds/updates translations

intervention/models.py

@@ -174,7 +174,7 @@ class Intervention(BaseObject):
         """ Quality check
 
         Returns:
-            ret_msgs (list): True if quality acceptable, False otherwise
+            ret_msgs (list): Holds error messages
         """
         ret_msgs = []