Delete Events have a delay in the JOC Gui

Current Situation

When deleting an event from the JOC GUI events list it takes some time until the delete is reflected in the list. The reason is that the event processor executes the deletion and it takes some time until everything is done.

Desired Behavior

The view shows all events that are stored in the database. As the real deletion is some time after the click on the delete button, the view is correct. But there should be a feedback for the user that something happens in the background. Therefore the deleted row should be dimmed when the user clicks the delete button