Add Simplified Chinese as a system language

The installer asks for the language before the keyboard, and
Setup > Language (omarchy language en|zh) switches it later. Under
zh_CN the menu reads its labels from omarchy-menu.zh-cn.jsonc, the
shell from I18nZh.js through I18n.tr, and notifications are worded
by their sender through omarchy-text, which reads the same table.
User text is never translated.

bin/omarchy-hyprland-window-single-square-aspect-toggle

@@ -3,6 +3,6 @@
 # omarchy:summary=Toggle single-window square aspect ratio.
 
 case $(omarchy-hyprland-toggle single-window-aspect-ratio) in
-  on) omarchy-notification-send -g  "Enable single-window square aspect ratio" ;;
-  off) omarchy-notification-send -g  "Disable single-window square aspect ratio" ;;
+  on) omarchy-notification-send -g  "$(omarchy-text "Enable single-window square aspect ratio")" ;;
+  off) omarchy-notification-send -g  "$(omarchy-text "Disable single-window square aspect ratio")" ;;
 esac