Hi there and welcome to the Community, @stefan_zhang 
1. Unfortunately, there is no way to automatically translate the widget based on the language versions of the website.
I’ve added this idea to the Wishlist on your behalf - Multilanguage versions for 1 widget. If this request gains more votes, it might be considered in the future.
At the moment, there are 2 options for this case:
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Create a separate widget for each website and translate the review text using the Auto- Translate option (this feature is available starting with the Pro plan)
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Install our Website Translator widget to your website, which will translate the content of the page, where it’s installed (including Google Reviews widget)
2. If I got it right you wanted to use one widget with different designs based on the page, where it’s installed.
If so, the only solution is to create a separate widget for each page. Once this done, please describe in details what should be customized. We’ll be happy to assist you with it 