Configure sddm language

lib/configuration.nix

@@ -3,6 +3,7 @@
     ./modules/custom-build-vm.nix
     ./modules/custom-sops-nix.nix
     ./modules/my-users.nix
+    ./modules/sddm.nix
   ];
 
   config = {

lib/modules/sddm.nix

@@ -0,0 +1,14 @@
+{ config, lib, ... }: {
+  config = {
+    services.displayManager.sddm = lib.mkIf config.services.displayManager.sddm.wayland.enable {
+      settings.General.GreeterEnvironment = (
+        lib.concatStringsSep " " (
+          let
+            localeConf = config.i18n.extraLocaleSettings;
+          in
+            builtins.map
+              (name: "${name}=${localeConf.${name}}")
+              (builtins.attrNames localeConf)));
+    };
+  };
+}