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-menu-share

@@ -33,7 +33,7 @@ else
   picked=$(omarchy-file-select "${select_args[@]}") || status=$?
 
   if ((${status:-0} > 1)); then
-    omarchy-notification-send -g "" -u critical "Could not share" "The file chooser did not open"
+    omarchy-notification-send -g "" -u critical "$(omarchy-text "Could not share")" "$(omarchy-text "The file chooser did not open")"
     exit 1
   fi