opencart-languagepack-finnish/catalog/common/maintenance.php

<?php
// Heading
$_['heading_title']    = 'Huolto';

// Text
$_['text_maintenance'] = 'Huolto';
$_['text_message']     = '<h1 style="text-align:center;">We are currently performing some scheduled maintenance. <br/>We will be back as soon as possible. Please check back soon.</h1>';