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-theme-remove

@@ -35,5 +35,5 @@ fi
 
 # Now remove the theme directory for THEME_NAME
 rm -rf "$THEME_PATH"
-omarchy-notification-send "Theme removed" "$THEME_NAME" || true
+omarchy-notification-send "$(omarchy-text "Theme removed")" "$THEME_NAME" || true
 echo "Removed $THEME_NAME"