替换 bbPress 默认角色用户名的方法,比较实在的自定义
// 替换 bbPress 默认角色用户名
add_filter( 'bbp_get_dynamic_roles', 'ntwb_bbpress_custom_role_names' );
function ntwb_bbpress_custom_role_names() {
	return array(
		// Keymaster
		bbp_get_keymaster_role() => array(
			'name'         => '管理员',
			'capabilities' => bbp_get_caps_for_role( bbp_get_keymaster_role() )
		),
		// Moderator
		bbp_get_moderator_role() => array(
			'name'         => '版主',
			'capabilities' => bbp_get_caps_for_role( bbp_get_moderator_role() )
		),
		// Participant
		bbp_get_participant_role() => array(
			'name'         => '社区成员',
			'capabilities' => bbp_get_caps_for_role( bbp_get_participant_role() )
		),
		// Spectator
		bbp_get_spectator_role() => array(
			'name'         => '观众',
			'capabilities' => bbp_get_caps_for_role( bbp_get_spectator_role() )
		),
		// Blocked
		bbp_get_blocked_role() => array(
			'name'         => '禁闭用户',
			'capabilities' => bbp_get_caps_for_role( bbp_get_blocked_role() )
		)
	);
}
在官方社区搜索到的, https://bbpress.org/forums/topic/addchange-user-roles/