Rocky Linux

Has SELinux, but probably fine to let it run on a pure client workstation.

Some things not available from Rocky repos, but you can use flatpak wrapper to run it.
dnf install flatpak
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
flatpak install flathub org.gnome.Genius   # example end app install
flatpak run --command=genius org.gnome.Genius               # example end app execution


Language addition does not involve local*gen* stuff like with ArchLinux.  Instead:
    dnf search langpacks­pl  # check
    dnf search langpacks­de  # check
    dnf install search glibc-langpack­pl
    dnf install search glibc-langpack­de
    (Unlike on Linux, you can't install only specified dialects but get ALL de_*, etc.)
    
[default stuff with localectl and /etc/local.conf work the same as with ArchLinux]