After choosing english as default an german as additional language it went further but kicked me off with
Fatal error: Allowed memory size of 44040192 bytes exhausted (tried to allocate 24 bytes) in /srv/www/vhosts/vXXXXXX.1blu.de/httpdocs/ez/ezpublish-3.9.0/lib/ezxml/classes/ezxml.php on line 499 Fatal error: eZ publish did not finish its request
The execution of eZ publish was abruptly ended, the debug output is present below.