You would need first to configure the file /etc/locale.gen, as there the following entries:
The entry selected (the exact same notation) need to be also therefore afterwards selection in the file /etc/locale.conf
Afterwards you execute locale-gen. And again: Please provide examples of YOUR configuration!
Tryout and test your configuration also, nothing can go further wrong. But please give insights of your configuration instead of reporting generic problems.
Human being in favor with clear principles and so also for freedom in soft- and hardware!
Certainly anyone who has the power to make you believe absurdities has the power to make you commit injustices: For a life of every being full with peace and kindness, including diversity and freedom. Capitalism is destroying our minds, the planet itself and the universe in the end!