Link issues in partners.pot

Hello

Both links advertised by this string* 

<a href="http://www.opensourcepress.de/">Open Source Press</a> is the
Munich-based publisher of the book <a
href="http://debiansystem.info/">The Debian System</a>. For each book
sold, the publisher and author together donate 1&euro; to the Debian
Project.

seems to have issues.

The first, http://www.opensourcepress.de/ doesn’t look like a publishing
site. It doesn’t show any book.

The second, http://debiansystem.info/ is dead.

Regards,
Besnik

*
  https://salsa.debian.org/webmaster-team/webwml/-/blob/master/english/po/partners.pot