What is the thing in KDE that override my locale settings
Solution 1:
Ok I erased the content of ~/.kde/env/setlocale.sh, and it works!
Tkanks!!
Solution 2:
Maybe better workaround for this is clearing setlocale.sh and setting it as read only file with:
cd ~/.kde/env/setlocale.sh
> setlocale.sh
chmod 444 setlocale.sh
now you would be ignoring completely settings in GUI and will have working settings from:
/etc/default/locale