Version 0.3
1. Despite a default MediaWiki language of "en", Special:PopularPages actually uses the page name Special:Beliebteste_Seiten.
This may be due to an error in HitCounters.i18n.alias.php using "en" not "de":
$specialPageAliases['en'] = [
'PopularPages' => [
'Beliebteste_Seiten' ],
];