fix: set default locale to en_NZ

Author: kid

modules/nixos/environment/i18n.nix

@@ -1,13 +1,6 @@
 {
   i18n = {
-    supportedLocales = [
-      "en_US.UTF-8/UTF-8"
-      "en_BE.UTF-8/UTF-8"
-    ];
-
-    extraLocaleSettings = {
-      LC_MESSAGES = "en_US.UTF-8";
-      LC_TIME = "en_BE.UTF-8";
-    };
+    # Not in NZ, but closest to what I want
+    defaultLocale = "en_NZ.UTF-8";
   };
 }