Then try again (you may need to log out/in or restart).
If that doesn't help, edit /etc/locale.gen then uncomment en_US UTF-8 and run locale-gen again - some software only works with en_US (for stupid reasons).
$gwe
Traceback (most recent call last):
File “/usr/bin/gwe”, line 53, in
from gwe import main
File “/usr/lib/python3.9/site-packages/gwe/main.py”, line 52, in
locale.setlocale(locale.LC_ALL, locale.getlocale())
File “/usr/lib/python3.9/locale.py”, line 610, in setlocale
return _setlocale(category, locale)
locale.Error: unsupported locale setting
However running these two lines fixes this problem till next reboot