ui: 修复部分情况下无法正常下载题目的问题

packages/ui-default/components/scratchpad/ScratchpadToolbarContainer.jsx

@@ -80,7 +80,9 @@ export default connect(mapStateToProps, mapDispatchToProps)(class ScratchpadTool
 
   render() {
     const LANGS = {};
+    const prefix = new Set(Object.keys(window.LANGS).filter((i) => i.includes('.')).map((i) => i.split('.')[0]));
     for (const key in window.LANGS) {
+      if (prefix.has(key)) continue;
       if (UiContext.pdoc.config.langs && !UiContext.pdoc.config.langs.includes(key)) continue;
       LANGS[key] = window.LANGS[key];
     }