i18n: Move module to services

modules/services/i18n/default.nix

@@ -0,0 +1,23 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.ptw.system.i18n;
+in {
+  options.ptw.system.i18n = {
+    enable = lib.mkEnableOption "Configure i18n services on the system";
+  };
+
+  config = lib.mkIf cfg.enable {
+    i18n.inputMethod = {
+      enabled = "fcitx";
+      ibus.engines = with pkgs.ibus-engines; [ mozc ];
+    };
+
+    #environment.variables = {
+    #  # TODO: Use pam_environment
+    #  "GTK_IM_MODULE" = "xim";
+    #  "XMODIFIERS" = "@im=ibus";
+    #  "QT_IM_MODULE" = "xim";
+    #};
+  };
+}