Sprache wird nicht angeboten zum ändern/Langugae option not visibile


i have updated my nextcloud to the current version to solve this problem, but nothing helpfs.
I have als changed the force_langugae = ‘’, but still the same.

Nobody of my accounts has the field/dropbox “Language” in their Account-Options.
How can i add or change this?

If i go to the user-list with the admin account and i set “show language”, their will be no user shown anymore.

Is their something wrong with my config?