Thank you for contacting Syncfusion support.
We have prepared the sample to localize the delete conformation dialog which can be viewed from the below link.
<Code>
var customizationMessage = {
DeleteConfirmation: "Are you sure want to delete this attendance entry ?",
Delete: "Yes",
Cancel: "No",
MouseOverDeleteTitle: "Delete Alert"
}
$.extend(ej.Schedule.Locale["en-US"], customizationMessage);
</Code>
Unlike appointmentWindowOpen, no event will be triggered while opening the delete alert window.
Regards,
Karthigeyan