the plan is effectively to simply include the content and title of an existing post. (everything is a post in the wordpress database)

you will need to

1. create a page „nothing found“

2. click on „short-link“ to get the ID of the post

3. modify the file

/yourdomain.com/wp-content/themes/yourtheme-child/content-none.php
<section class="no-results not-found">
    <header class="page-header">
        <h2 class="page-title"><?php _e( 'Nothing Found', 'residium' ); ?></h2>
    </header><!-- .page-header -->

    <div class="page-content">
        <?php
            $lang = get_bloginfo('language'); // get lang of current post (i hope so)
            if($lang == 'de-DE')
            {
                $post = sh_the_content_by_id(3142); // zeige Inhalt/content von Post (im Kurzlink steht die ID) von yourdomain.com/index.php/leider-keine-suchergebnisse/ an
            }
            else // assume english
            {
                $post = sh_the_content_by_id(3147); // zeige Inhalt/content von Post (im Kurzlink steht die ID) von yourdomain.com/index.php/unfortunately-nothing-was-found/ an
            }
           
            echo '<script type="text/javascript">document.title = "'.$post->post_title.'";</script>'; // ändere Seitentitel
            get_search_form(); // Zeige das Suchfenster an
        ?>
    </div><!-- .page-content -->
</section><!-- .no-results -->
admin