Changing LC_MESSAGES changes WHOLE SYSTEM language

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1

Using Fedora 42 (I quickly tested with 41, it’s the same behavior) with Gnome.
My native language is Polish. I want to have everything in my native Polish language, except console/terminal messages which I want in English. In every other distro, what I did, was set adding line export LC_MESSAGES=en_US.UTF-8 to .bashrc file. After doing that, my WHOLE SYSTEM in in English. If I set that to for example German, my whole system will be in German. At the same time, all other locales are still pl_PL.UTF-8.
locale command output:
LANG=pl_PL.UTF-8

LC_CTYPE="pl_PL.UTF-8"

LC_NUMERIC="pl_PL.UTF-8"

LC_TIME="pl_PL.UTF-8"

LC_COLLATE="pl_PL.UTF-8"

LC_MONETARY="pl_PL.UTF-8"

LC_MESSAGES=en_US.UTF-8

LC_PAPER="pl_PL.UTF-8"

LC_NAME="pl_PL.UTF-8"

LC_ADDRESS="pl_PL.UTF-8"

LC_TELEPHONE="pl_PL.UTF-8"

LC_MEASUREMENT="pl_PL.UTF-8"

LC_IDENTIFICATION="pl_PL.UTF-8"

LC_ALL=

localectl status command output:
System Locale: LANG=pl_PL.UTF-8

VC Keymap: pl

X11 Layout: pl

sudo cat /var/lib/AccountsService/users/kuba-fedora command output:

[User]

Languages=pl_PL.UTF-8;

Session=

PasswordHint=

Icon=/var/lib/AccountsService/icons/kuba-fedora

SystemAccount=false

Changing LC_MESSAGES with localectl set-locale results in the exact same situation. And at the same time, in Gnome Settings → Regions&Language are also still Polish.

(After changing anything, to be 100% sure I’m rebooting)

What the heck? I can’t change language in console/terminal for English without changing the whole system’s language? I’ve never encountered anything like that in other distros. That looks like some bug, or I’m doing something wrong.

2

I’m not sure what is going on, but will make an educated guess, hope this helps.
I would not put the export in the .bashrc, that is usually a bad idea, global config like that belongs in .bash_profile usual to avoid issues. Like overrides typed at the terminal prompt seeming not to work.

Try removing from .bashrc and look in gnome terminal for a setting to change the command it runs when it starts up. That is what I can do in KDE’s kconsole terminal app.

I’m not a gnome user, but assume you will find you can run a custom command each time a terminal starts. Set your LC_MESSAGE in that command.