Clarify translation.

i18n/en.i18n.json

@@ -153,7 +153,7 @@
   "card-edit-attachments": "Edit attachments",
   "card-edit-custom-fields": "Edit custom fields",
   "card-start-voting": "Start voting",
-  "card-cancel-voting": "Delete voting",
+  "card-cancel-voting": "Delete voting and all votes",
   "card-edit-labels": "Edit labels",
   "card-edit-members": "Edit members",
   "card-labels-title": "Change the labels for the card.",