[@macpresss Participant 11 years, 1 month ago]

Yes great find, thank you Robkk,

Now you can also do this, ..and make the pagination an unordered list like it should be by the default. 🙂

function ntwb_bbpress_custom_pagination( $args ) {

	$args['type'] = 'list';
	$args['prev_text'] = 'previous';
	$args['next_text'] = 'next';

	return $args;

}
add_filter( 'bbp_topic_pagination', 'ntwb_bbpress_custom_pagination' );

WP Codex: all those args should probably work now.
https://codex.wordpress.org/Function_Reference/paginate_links