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-font-set

@@ -74,11 +74,11 @@ XML
 omarchy-restart-shell
 
 if pgrep -x ghostty; then
-  omarchy-notification-send -g  "You must restart Ghostty to see font change"
+  omarchy-notification-send -g  "$(omarchy-text "You must restart Ghostty to see font change")"
 fi
 
 if pgrep -x foot; then
-  omarchy-notification-send -g  "You must restart Foot to see font change"
+  omarchy-notification-send -g  "$(omarchy-text "You must restart Foot to see font change")"
 fi
 
 omarchy-hook font-set "$font_name"