wp-travel-customize

function wp_travel_custom_gettext_string_editor( $string ){

	switch ($string) {
		case '%s Day(s) %s Night(s)':
		
			return '%s Hour(s) %s Minute(s)';	
				
		break;

		case 'Day(s)' :

			return 'Hour(s)';

		break;

		case 'Night(s)' :

			return 'Minute(s)';

		break;

		case 'Day(s):' :

		return 'Hour(s):';

		break;

		case 'Night(s):' :

			return 'Minute(s):';

		break;

	}

	return $string;

}

add_filter( 'gettext', 'wp_travel_custom_gettext_string_editor', 30 );