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-display-text-size

@@ -169,7 +169,7 @@ set_terminal_size() {
       [[ $prev_id =~ ^[0-9]+$ ]] && replace=(-r "$prev_id")
       local new_id
       new_id="$(omarchy-notification-send \
-        "Restart Foot to apply the new terminal font size" \
+        "$(omarchy-text "Restart Foot to apply the new terminal font size")" \
         "${replace[@]}" -p 2>/dev/null)" || true
       [[ $new_id =~ ^[0-9]+$ ]] && printf '%s\n' "$new_id" >"$id_file"
     fi