Add strings.

en.json

@@ -284,6 +284,7 @@
                     "confirm_close_dm_long": "You can re-open it later but it will disappear on both sides.",
                     "confirm_delete": "Delete {{name}}?",
                     "confirm_delete_long": "Once it's deleted, there's no going back.",
+                    "confirm_delete_message_long": "Are you sure you want to delete this?",
                     "create_invite_generate": "Generating invite…",
                     "create_invite_created": "Here is your new invite code:"
                 },
@@ -299,6 +300,7 @@
                     "ok": "Ok",
                     "save": "Save",
                     "close": "Close",
+                    "delete": "Delete",
                     "update": "Update",
                     "cancel": "Cancel",
                     "preview": "Preview",