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-tailscale-receive

@@ -59,7 +59,7 @@ claim_path() {
 announce() {
   local path="$1"
   local name="${path##*/}"
-  local args=("Received $name" "Saved to ${dir/#$HOME/~}" -u critical)
+  local args=("$(omarchy-text "Received %1" "$name")" "$(omarchy-text "Saved to %1" "${dir/#$HOME/~}")" -u critical)
 
   case "${name,,}" in
   *.png | *.jpg | *.jpeg | *.gif | *.webp | *.avif | *.bmp | *.tif | *.tiff)