BuddyPress.org

I would like to edit a sentence in the bp-group-template.php file (the $message on line 1884). How can I create a hook or in some way edit this so as not to edit bp core file? I have seen suggestions about the .pot file, but I believe that gets overwritten on an update? I would prefer something I can put in my theme file.
I am using a custom Genesis Child theme on the site. I am using WordPress 4.4.1 and BuddyPress 2.4.3. My group is protected so cannot share the url, but you can see a screenshot here:
https://www.dropbox.com/s/e5ln7j5nj8s1wjy/Screenshot%202016-01-26%2020.46.59.png?dl=0

Thank you!

function bp_get_groups_pagination_count() {
global $groups_template;

$start_num = intval( ( $groups_template->pag_page – 1 ) * $groups_template->pag_num ) + 1;
$from_num = bp_core_number_format( $start_num );
$to_num = bp_core_number_format( ( $start_num + ( $groups_template->pag_num – 1 ) > $groups_template->total_group_count ) ? $groups_template->total_group_count : $start_num + ( $groups_template->pag_num – 1 ) );
$total = bp_core_number_format( $groups_template->total_group_count );

if ( 1 == $groups_template->total_group_count ) {
$message = __( ‘Click the name of the group below to view your Challenge Group.’, ‘buddypress’ );
} else {
$message = sprintf( _n( ‘Viewing %1$s – %2$s of %3$s group’, ‘Viewing %1$s – %2$s of %3$s groups’, $groups_template->total_group_count, ‘buddypress’ ), $from_num, $to_num, $total );
}