add den pattern

modules/core/locales.nix

@@ -0,0 +1,23 @@
+{ config, lib, pkgs, ... }:
+
+let
+  dirModules = config.features.modules.core or { };
+in
+{
+  config = lib.mkIf ((dirModules.enable or false) && (dirModules.locales.enable or true)) {
+    time.timeZone = "Europe/Amsterdam";
+
+    i18n.defaultLocale = "en_US.UTF-8";
+    i18n.extraLocaleSettings = {
+      LC_ADDRESS = "nl_NL.UTF-8";
+      LC_IDENTIFICATION = "nl_NL.UTF-8";
+      LC_MEASUREMENT = "nl_NL.UTF-8";
+      LC_MONETARY = "nl_NL.UTF-8";
+      LC_NAME = "nl_NL.UTF-8";
+      LC_NUMERIC = "nl_NL.UTF-8";
+      LC_PAPER = "nl_NL.UTF-8";
+      LC_TELEPHONE = "nl_NL.UTF-8";
+      LC_TIME = "nl_NL.UTF-8";
+    };
+  };
+}