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-system-logout

@@ -6,7 +6,7 @@
 
 nohup bash -c "sleep 2 && uwsm stop" >/dev/null 2>&1 &
 
-omarchy-osd -i logout -m "Logging out" -d 5000
+omarchy-osd -i logout -m "$(omarchy-text "Logging out")" -d 5000
 
 # Now close all windows
 omarchy-hyprland-window-close-all