Refactoring: add metatagging, add 'last edited by' element, add 'metacondition'

langs/shared-questions/en.json

@@ -131,6 +131,13 @@
             "question": "What is the network name for the wireless internet access?",
             "render": "The network name is <b>{internet_access:ssid}</b>"
         },
+        "last_edit": {
+            "render": {
+                "special": {
+                    "text": "Last edited on {_last_edit:timestamp} by {_last_edit:contributor}"
+                }
+            }
+        },
         "level": {
             "mappings": {
                 "0": {