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.

test/shell.d/screenrecording-wf-audio-test.sh

@@ -41,6 +41,7 @@ echo "notify $*" >>"$TMP/notes"
 echo "noise on stdout"
 SH
 chmod +x "$tmp/bin"/*
+ln -s "$ROOT/bin/omarchy-text" "$tmp/bin/omarchy-text"
 
 device() {
   rm -f "$tmp/calls" "$tmp/notes" "$tmp/next" "$tmp/modules"