grimm-nix-shared/modules/localisation.nix

{ config, lib, ... }: let
  cfg = config.grimmShared;
in {
  config = with cfg; lib.mkIf (enable && locale) {
    time.timeZone = "Europe/Berlin";

    # Select internationalisation properties.
    i18n.defaultLocale = "en_US.UTF-8";
  
    i18n.extraLocaleSettings = {
      LC_ADDRESS = "de_DE.UTF-8";
      LC_IDENTIFICATION = "de_DE.UTF-8";
      LC_MEASUREMENT = "de_DE.UTF-8";
      LC_MONETARY = "de_DE.UTF-8";
      LC_NAME = "de_DE.UTF-8";
      LC_NUMERIC = "de_DE.UTF-8";
      LC_PAPER = "de_DE.UTF-8";
      LC_TELEPHONE = "de_DE.UTF-8";
      LC_TIME = "de_DE.UTF-8";
    };

    console.keyMap = "de";

    services.xserver.xkb = {
      layout = "de";
      variant = "";
    };
  };
}