The only thing I've done, I changed these parts:
// Show RSS link, as well as the copyright.
// Footer is full-width. Wrapper inside automatically matches admin width setting.
echo '
<footer id="footer_section"><a id="bot"></a>
<div class="wrapper">
<ul>
<li class="copyright">',
theme_copyright(), '
</li>
<li class="copyright">| <a href="https://forum-alternative-antriebe.de/index.php/topic,5226.0.html">Forum-Knigge</a></li>
<li class="copyright">| <a href="https://forum-alternative-antriebe.de/index.php/topic,7773.0.html">Datenschutzerklärung</a></li>
<li class="copyright">| <a href="https://forum-alternative-antriebe.de/index.php/topic,7255.0.html">Impressum</a></li>',
!empty($context['newsfeed_urls']['rss']) ? '<li>
<a id="button_rss" href="' . $context['newsfeed_urls']['rss'] . '" class="rssfeeds new_win"><i class="icon icon-margin i-rss icon-big"><s>' . $txt['rss'] . '</s></i></a>
</li>' : '',
'</ul>';
and:
// Anything special to put out?
if (!empty($context['insert_after_template']))
echo $context['insert_after_template'];
echo '
<script type="text/javascript" src="https://forum-alternative-antriebe.de/cookie_bar/cookiebar-latest.min.js?theme=grey&always=1&showNoConsent=1&top=1"></script>
</body>
</html>';
}
Even with the default theme I can't reach the page. But my default looks much like my blueish theme, so I plan to upload the default from an install package and check it then. But to be sure I plan to rename the default to keep it as a backup first.