I already know what you're looking for.
In admin_html.pl find the following and feel free to change your subjet line.

##########################################################
## Email Messages ##
##########################################################

sub html_validate_email {
my $subject = "Your link has been added!";

sub html_modify_email {
my $subject = "Your link has been modified!";

sub html_reject_email {
my $subject = "Your link has been rejected.";


Regards,

Nuno Duque
--------------------
Macau Search Engine
inmacau.com