Attrap: first_saw_on -> first_seen_on

Attrap.py

@@ -128,7 +128,7 @@ class Attrap:
                 'name': self.name,
                 'date': self.date_str,
                 'url': quote(self.url, safe='/:'),
-                'first_saw_on': datetime.datetime.now(datetime.timezone.utc).strftime("%d/%m/%Y %H:%M:%S%z"),
+                'first_seen_on': datetime.datetime.now(datetime.timezone.utc).strftime("%d/%m/%Y %H:%M:%S%z"),
                 'pdf_creation_date': pdf_creation_date_json,
                 'pdf_modification_date': pdf_modification_date_json
             }