Dann fehlt möglicherweise die datei /administrator/manifests/packages/pkg_de-DE.xml

INSERT INTO `he3u9_update_sites` VALUES (1,'Joomla! Core','collection','https://update.joomla.org/core/list.xml',1,1476574053,''),(2,'Joomla! Extension Directory','collection','https://update.joomla.org/jed/list.xml',1,1476574054,''),(3,'Accredited Joomla! Translations','collection','https://update.joomla.org/language/translationlist_3.xml',1,1476574415,''),(4,'Joomla! Update Component Update Site','extension','https://update.joomla.org/core/extensions/com_joomlaupdate.xml',1,1476574057,''),(5,'Weblinks Update Site','extension','https://raw.githubusercontent.com/joomla-extensions/weblinks/master/manifest.xml',1,1476574058,''),(6,'WebInstaller Update Site','extension','http://appscdn.joomla.org/webapps/jedapps/webinstaller.xml',1,0,'');