Default Language setting not working after upgrade to Nextcloud 11

Hi,

I’m currently moving my old owncloud server (8.2.9) from an Ubuntu 12.04 LTS to SUSE Enterprise 12.
Upgrading from OC 8 to NC 9 to 10 everything’s fine, but when I upgrade from 10 to 11, the default_language option in config.php doesn’t work anymore. NC shows up in german, when I’ve set the default language to english.

'default_language' => 'en',

When I Upgrade from 9.0.56 to 10.0.3 it also logs:
starting upgrade from 9.0.56.2 to 9.1.3.2

From 10.0.3 to 11.0.1:
starting upgrade from 9.1.3.2 to 11.0.1.2

My Environment:
SUSE Enterprise 12
PHP 7.0.7
MariaDB 10.0.28

My changes to php.ini:

upload_max_filesize = 0
max_file_uploads = 200
post_max_size = 7G
max_execution_time = 9000
max_input_time = 9000
memory_limit = 2G
session.gc_maxlifetime = 9000

So if I read it correctly. It will be changed back in an upcoming release?