Can you change the ticket merge message?

Hi,

I've just found out the ticket merge option, which is very useful for us. After first using it I've realised it sends a message to the requester.

It's not a bad message, but the fact that there's no line break between two sentences is slightly annoying for me, so I'd like to change it.

I've expected this message to be editable through Settings >Tickets > Rules and notifications, but it's not there.

So the question is - is this message editable? Where can you edit it?

Thanks