Change language

How can I change QubesOS language to japanese?

sudo qubes-dom0-update langpacks-ja

I tried this already. But Ianguage didn’t change

What about the solution proposed in the second link?

nothing changed

Can you list the exact steps you followed?

sudo qubes-dom0-update system-config-language
sudo system-config-language

after this I chose Japanese in dom0 language selection.

Did you get any error message?
Did you reboot?
Any other relevant information?

I didn’t get any error message.
yes, I rebooted.

Also, Japanese was already selected in dom0 language selection.