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-audio-output-switch

@@ -13,7 +13,7 @@ sinks=$(timeout 2 pactl -f json list sinks |
 sinks_count=$(jq 'length' <<<"$sinks")
 
 if (( sinks_count == 0 )); then
-  omarchy-osd -m "No audio devices found"
+  omarchy-osd -m "$(omarchy-text "No audio devices found")"
   exit 1
 fi