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<?php
/**
 * Gravity Perks // GP Multi-page Navigation // Modify Frontend Labels
 * http://gravitywiz.com/documentation/gravity-forms-multi-page-navigation/
 */
add_filter( 'gpmpn_frontend_labels', 'modify_gpmpn_frontend_labels', 10, 2 );
function modify_gpmpn_frontend_labels( $labels, $form ) {
	$labels['backToLastPage'] = 'My Custom Button Label';
	$labels['submit'] = 'Submit';
	$labels['nextPageWithErrors'] = 'Next Page with Errors';
	return $labels;
}

/**
 * Gravity Perks // GP Multi-page Navigation // Add Submit Button on Last Page w/ Errors
 * http://gravitywiz.com/documentation/gravity-forms-multi-page-navigation/
 */
add_filter( 'gpmpn_enable_submission_from_last_page_with_errors', '__return_true' );

/* style all page links */ 
.gpmpn-step-linked {
    /* custom styles */
}

/* style current page/step */
.gpmpn-step-current {
    /* custom styles */
}