How to change text in Points reporting screens

Just getting back to working with Userpoints. I have been trying to change the column header text on the points reports. I want to change "Category" and "Reason" to be labeled with different words. I have been working with changing code in the userpoints.module file, here:

if ($settings['show_category']) {
$header[] = array('data' => t('Category'), 'field' => 't.name', 'class' => array('userpoints-transactions-header-category'));
}
$header[] = array('data' => t('Date'), 'field' => 'time_stamp', 'sort' => 'desc', 'class' => array('userpoints-transactions-header-timestamp'));
$header[] = array('data' => t('Reason'), 'class' => array('userpoints-transactions-header-reason'));

If I change the headers here, they don't change in my Points screen. Where's the place the header names are specified if not here?

Thanks!