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-plugin-clone

@@ -159,8 +159,8 @@ done
 omarchy-plugin-enable "$new_id" >/dev/null
 clone_complete=1
 omarchy-notification-send -g 󰐱 \
-  "Editing Cloned Plugin" \
-  "Original plugin has been replace by clone."
+  "$(omarchy-text "Editing Cloned Plugin")" \
+  "$(omarchy-text "Original plugin has been replace by clone.")"
 echo "Cloned $source_id to $target_dir and switched to $new_id"
 if (( edit_clone )); then
   # Word-splitting is deliberate: EDITOR may carry flags.