Filter doesn't work at some array

I’m trying to Filter those three items of a Core function.

$r = bbp_parse_args( $args, array(
		'subscribe'   => __( 'Subscribe',   'bbpress' ),
		'unsubscribe' => __( 'Unsubscribe', 'bbpress' ),
		'before'      => ' | ',
	), 'get_user_subscribe_link' );

So I made this, as I don’t need the translation part.

function shmoo_change_subs( $r ) {
	$args = '';
	$r = bbp_parse_args( $args, array(
		'subscribe'   => 'test1',
		'unsubscribe' => 'test2',
		'user_id'     => 0,
		'topic_id'    => 0,
		'forum_id'    => 0,
		'before'      => '',
		'after'       => ''
	), 'get_user_subscribe_link' );

	return $r;
}
add_filter( 'bbp_get_user_subscribe_link', 'shmoo_change_subs' );

But it results in this error msg,

Notice: Array to string conversion in … blablabla

I think the __( translation string ) from the source is the problem here. How do you surpass that ?

I’m starting at making Filters and everything was going just fine till now.