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-input-mute

@@ -6,8 +6,8 @@ wpctl set-mute @DEFAULT_AUDIO_SOURCE@ toggle >/dev/null
 
 if wpctl get-volume @DEFAULT_AUDIO_SOURCE@ | grep -q MUTED; then
   omarchy-brightness-keyboard-mute on
-  omarchy-osd -i microphone-muted -m "Microphone muted"
+  omarchy-osd -i microphone-muted -m "$(omarchy-text "Microphone muted")"
 else
   omarchy-brightness-keyboard-mute off
-  omarchy-osd -i microphone -m "Microphone on"
+  omarchy-osd -i microphone -m "$(omarchy-text "Microphone on")"
 fi