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-battery-low

@@ -13,5 +13,5 @@ fi
 
 level=$1
 
-omarchy-notification-send -g 󱐋 -u critical "Time to recharge!" "Battery is down to ${level}%" -i battery-caution -t 30000
+omarchy-notification-send -g 󱐋 -u critical "$(omarchy-text "Time to recharge!")" "$(omarchy-text "Battery is down to %1%" "$level")" -i battery-caution -t 30000
 omarchy-hook battery-low "$level"