<a target="_blank" rel="nofollow" --> that part of the code it's to open the web translated in another window.
<img style="border:0 solid;cursor:pointer;width:32px;height:32px" alt="Google-Translate-Chinese" src="[CHINA_FLAG_ICON_32X32]" title="Google-Translate-Chinese"></a> --> You can insert in [CHINA_FLAG_ICON_32X32] a 32x32 icon with the Chinese Flag.
You can use this code with different flags and different Google-Translate-[language] to translate your web.
It's another method to use Google Translate but without .css or .js in your web. It's an example.
If you copy the code to your hosting (like Google Drive or something), If Google updates its code, you will not have that update and you might have bugs.
You can use the method you like. But if your score it's not bad, don't worry it's only a suggestion not a mandatory change.
Best regards!