Description of problem:

sddm login always displays en_US.UTF-8 language, no matter what language is set in system settings (in my case the system is KDE with Wayland).

Version-Release number of selected component (if applicable):


How reproducible:

Always.

Steps to Reproduce:
1. Set default language in system settings to any non-english language
2. Reboot the system.
3. 

Actual results:

sddm greets you with english language.

Expected results:

sddm greets you with selected non-english language

Additional info:

The problem is that system setting component does *NOT* change settings in /etc/locale.conf to selected language. Changing the LANG setting manually to e.g.

LANG="sl_SI.utf8"

fixes the problem.

The problem is either in the sddm configuration that uses /etc/locale.conf or in the system setting component that does not update the setting in /etc/locale.conf when new language is selected.