How to set a language's default locale

[Albert Astals Cid]

El diumenge, 12 d’abril del 2026, a les 0:04:14 (Hora d’estiu d’Europa 
central), Alexander Becker va escriure:
> Good evening, Charlotte!
> 
>    > Currently, when trying to load the language "Gaeilge" (ga), KDE is
> 
> trying to use the "ga_IE.UTF-8 at euro" locale by default in
> `~/.config/plasma-localerc`, which doesn't exist in glibc.

~/.config/plasma-localerc is set by the Region and Language module of system 
settings.

There seems to be quite some bugs in that module sadly and it is setting the 
wrong locale (i just tested it and it set the wrong locale for me).

I will try to have a look at the code and fix it but you may want to report a 
bug report.

> 
> 1. Are you sure "Gaeilge" is correct,
> https://l10n.kde.org/stats/gui/stable-kf6/team/ga/ says "Irish Gaelic (ga)".

Gaeilge is "Irish" in "Irish"

Cheers,
  Alber

> 
> 2. Why do you think your locale is not supported by glibc?
>     git clone https://sourceware.org/git/glibc.git
>     cd glibc
>     git log | grep ga_IE
>     => here I could see both ga_IE and ga_IE at euro locales
> 
>    > which doesn't exist in glibc. Due to this, a lot of programs don't
> 
> work or produce errors when trying to run a system in the language.
> 
> 3. I have tried locally in konsole:
> 
>    LANGUAGE=ga gwenview
>    LANGUAGE=ga_IE gwenview
>    LANGUAGE=ga_IE at euro gwenview
> 
>    Or for flatpak versions of apps:
> 
>    flatpak config --set extra-languages ga
>    flatpak config --list
>    flatpak update
>    LANGUAGE=ga flatpak run org.kde.kate
>    LANGUAGE=ga_IE flatpak run org.kde.kate
>    LANGUAGE=ga_IE at euro flatpak run org.kde.kate
> 
>    → In all variants I could see strings in your language and no errors.
> Which errors do you have (locale related)?
> 
> By the way: If you want to test newest translation which is not yet part
> of an application (e. g. Dolphin) you could do following:
> 
>    msgfmt dolphin.po -o dolphin.mo
>    mkdir -p ~/.local/share/locale/ga/LC_MESSAGES
>    cp dolphin.mo ~/.local/share/locale/ga/LC_MESSAGES
>    # start Dolphin and check new translated strings
> 
> I hope it will help you and your team.
> 
> Best regards
> Alexander