How to word the message before "Undo" button?

In our web-app's ui there's a few actions you can undo.

For example, you can delete messages or comments. To do that you click delete next to it. Then, there's a message that informs that action was completed and undo.

What is the best way to word the message before "Undo"? Is there any reason to word it in a specific way?

Message deleted. Undo

Message was deleted. Undo

The message is deleted. Undo

Message has been deleted. Undo