Auto email template - incorrect wording needs correcting

Hi there, when we use the system template for "Payroll Auto Email", the wording says:

"I've just completed the Monthly payrun for XXXXXXXXXXXXXXXXXXX.

Please see the attached the relevant files for Month 8 that haven't been emailed directly to employees.

even though it emails all payslips (which I want). The word "haven't" needs to be replaced by "have".

I have 85+ clients on our list, and I do not want to individually edit each client template to correct this. Is there a way of globally correcting the template?