generalize author attribution

views/templates/layout_normal.php

@@ -29,6 +29,6 @@
 </main>
 <footer>
     <p><span class="bold"><?= $_ENV['APP_NAME'] ?></span> <?= str_replace('Release_', '', VERSION) ?></p><!--
- --><p>&copy; Pőcze Bence <?= (new DateTime(REVISION_DATE))->format('Y') ?></p>
+ --><p>&copy; The Mapguesser Contributors <?= (new DateTime(REVISION_DATE))->format('Y') ?></p>
 </footer>
 @endsection