How to use utf-8:
The top of your config file should look like this:
use constant ADMIN_PASS => 'change this';
use constant NUKE_PASS => 'change this';
use encoding 'utf-8';
Note that use encoding is applied AFTER the admin passwords.
Also, NUKE is an offensive term for a country that was bombed by nuclear weapons, and why do you insist on swearing in comments to the source code?