Strange locale problem

[Beerislife]

My system is set to British English in KDE settings but my keyboard is US English and my timezone is Japan.

If I type:

locale

in a terminal I get:

LANG=en_GB.UTF-8
LANGUAGE=en_GB
LC_CTYPE="en_GB.UTF-8"
LC_NUMERIC=ja_JP.UTF-8
LC_TIME=en_GB.UTF-8
LC_COLLATE="en_GB.UTF-8"
LC_MONETARY=ja_JP.UTF-8
LC_MESSAGES="en_GB.UTF-8"
LC_PAPER=ja_JP.UTF-8
LC_NAME=ja_JP.UTF-8
LC_ADDRESS=ja_JP.UTF-8
LC_TELEPHONE=ja_JP.UTF-8
LC_MEASUREMENT=ja_JP.UTF-8
LC_IDENTIFICATION=ja_JP.UTF-8
LC_ALL=[/FONT]

etc/default/locale shows:

LANG=en_GB.UTF-8
LC_ADDRESS=en_GB.UTF-8
LC_IDENTIFICATION=en_GB.UTF-8
LC_MEASUREMENT=en_GB.UTF-8
LC_MONETARY=en_GB.UTF-8
LC_NAME=en_GB.UTF-8
LC_NUMERIC=en_GB.UTF-8
LC_PAPER=en_GB.UTF-8
LC_TELEPHONE=en_GB.UTF-8
LC_TIME=en_GB.UTF-8​

I used the dpkg reconfigure locales command until I'm green in the face but nothing seems to change when I type locale....

[Beerislife]

Found the problem in

~/.pam_environment

Edit: Wrong!

[Schwarzer Kater]

So you did not find the cause?

Do you have a file /etc/locale.conf or $HOME/.config/locale.conf? Those can be used by systemd, afaik.

You could also check $HOME/.config/plasma-localerc (but your Plasma locale settings seem to be fine as you posted…).

Did you check that the cause is not user-specific by logging in with another account?

[Beerislife]

/etc/locale.conf

LANG=en_GB.UTF-8
LC_ADDRESS=en_GB.UTF-8
LC_IDENTIFICATION=en_GB.UTF-8
LC_MEASUREMENT=en_GB.UTF-8
LC_MONETARY=en_GB.UTF-8
LC_NAME=en_GB.UTF-8
LC_NUMERIC=en_GB.UTF-8
LC_PAPER=en_GB.UTF-8
LC_TELEPHONE=en_GB.UTF-8
LC_TIME=en_GB.UTF-8​

$HOME/.config/locale.conf doesn't exist.

$HOME/.config/plasma-localerc

[Formats]
LANG=en_GB.UTF-8​

I'll try a new user when I wake up later...

[Beerislife]

I also found this file:

plasma-locale-settings.sh

Containing:

# Generated script, do not edit
# Exports language-format specific env vars from startkde.
# This script has been generated from kcmshell5 formats.
# It will automatically be overwritten from there.
export LANG=en_GB.UTF-8
export LC_NUMERIC=en_GB.UTF-8
export LC_TIME=en_GB.UTF-8
export LC_MONETARY=ja_JP.UTF-8
export LC_MEASUREMENT=en_GB.UTF-8
export LC_COLLATE=en_GB.UTF-8
export LANGUAGE=en_GB

[Schwarzer Kater]

Hm. I could not find "plasma-locale-settings.sh" on my computer - neither in KDE neon (Plasma 5.27), nor in openSUSE Tumbleweed KDE (Plasma 5.27) or Arch KDE (Plasma 5.27.1). Interesting…
Where did you find it on yours?

But "at least" there is export … - if this is not the format you want or get, this is something worth looking into, I would say:
Did you do anything special/extra to get Japanese language support for KDE Plasma? (Sorry if this is a dumb question, I have never had to use other languages than German and English.)