I have used that command and it indeed changed the language setting on my system. Looks like something is overwriting the value in the /etc/locale.conf file. If you are using Bash, check if there are anything setting the locale in /etc/profile, /etc/profile.d, /etc/bashrc, ~/.bash_profile, ~/.profile, ~/.bashrc, or any other file you use to set environment variables. If you are using another shell, check the related files to set your shell environment.
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