Convert {displayed_username} into displayed profile username

yzc_convert_dislayed_username_for_widgets_title.php

<?php
/**
 * Convert {displayed_username} into displayed profile username.
 */
function yzc_convert_displayed_username_for_widgets_title( $args, $widget ) {

    if ( $widget == 'friends' || $widget == 'groups' ) {
        $args['name'] = str_replace( '{displayed_username}', bp_core_get_username( bp_displayed_user_id() ), $args['name'] );

    }
    return $args;
}
add_filter( 'yz_profile_widget_args', 'yzc_convert_displayed_username_for_widgets_title', 10, 2 );