lang: prefer 'clear (snap) history' to 'scrub' (#721)

changedetectionio/changedetection.py

@@ -35,7 +35,7 @@ def main():
     create_datastore_dir = False
 
     for opt, arg in opts:
-        #        if opt == '--purge':
+        #        if opt == '--clear-all-history':
         # Remove history, the actual files you need to delete manually.
         #            for uuid, watch in datastore.data['watching'].items():
         #                watch.update({'history': {}, 'last_checked': 0, 'last_changed': 0, 'previous_md5': None})