[kh99]

There's no way to simply edit the phrase, you'd need a plugin. If you look at file includes/class_reportitem.php around line 194 you can see how the list is built, and at the same time an array called $mods is built with all the moderator info. So you could write a plugin using hook location report_do_report (which is called just after the array is built) which rebuilds $reportinfo['modlist'] using the info in the $mods array to include the moderator id.

The code could be something like:

if (!empty($mods))
{
    $reportinfo['modlist'] = '';
    foreach ($mods AS $moderator)
    {
        $reportinfo['modlist'] .= (!empty($reportinfo['modlist']) ? ', ' : '') . unhtmlspecialchars($moderator['username']) . ' (' . $moderator['userid'] . ')';
    }
}