Way to edit the notification sent after creating a user account

[kgr2020@nglt.pl]

Hello,
I'm looking for a way to edit the notification sent after creating a user account, notification contents:

"The user Kamil_Grochowski has created an account for you with username "TESTOWE". In order to complete your registration, visit the following URL (make sure it is entered as the single line) and set your own access password:

*LINK TO SET PASSWORD...

If you did not request any registration, ignore this message and nothing will happen.

Do not reply to this message"

Where should I look for this message template?

Please HELP

[cas]

That wiould mean adjusting a core file which is not the best way forward (needs to re-applied after each update of Mantis).
Loo at function email_signup in core/email_api.php

[atrol]

This is the way to customize strings
https://www.mantisbt.org/docs/master/en ... ze.strings
This works as long as you don't change the number or the ordering of placeholders in the string.
Whenver upgrading, check if the changed string is changed in MantisBT