Please explain your feature request to the best of your abilities:

I am using Towny and Skript with Skript-Towny add-on and when I cancel an event it sends "Sorry, this event was cancelled." The problem is that I wanted to change or disable that message but I can't find a way in the language file.
I suggest that you add a way to change or disable that message if that is possible.

Every CancellableTownyEvent has a setCancelMessage(String msg) method on it. You can use that to change your message.

how to I do that?

I don't know how skript is used but I would assume if you can get an event you can also modify the event. If you cannot do that with skript, consider learning java.

I don't know how skript is used but I would assume if you can get an event you can also modify the event. If you cannot do that with skript, consider learning java.

I don't think the Skript add-on I use for towny has that functionality.
But would it not be possible to add a way on the language files to change that message?

/**
 * A class extended by Towny Events which are Cancellable and which contain a
 * cancelMessage.
 * <p>
 * Having a getCancelMessage() available to us allows us to throw a
 * {@link CancelledEventException} which can use the cancelMessage in feedback
 * messaging or logging.
 * <p>
 * Used primarily in the
 * {@link ConfirmationBuilder#setCancellableEvent(CancellableTownyEvent)} and
 * {@link BukkitTools#ifCancelledThenThrow(CancellableTownyEvent)} code.
 * 
 * @author LlmDL
 * @since 0.98.4.0.
 */
public abstract class CancellableTownyEvent extends Event implements Cancellable {
	private boolean isCancelled = false;
	private String cancelMessage = "Sorry, this event was cancelled.";

It is not a translatable message so it is not translated, if that makes sense.