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Among locals in Hong Kong, OpenRice would be the most popular website/app for that purpose. There are reviews, photos, menu etc. about the restaurant.
The website/app have Chinese and English user interface, but since the user population is mainly Chinese speaker, so the reviews are usually in Chinese, which might not be so helpful for you. Don't expect menu will always be available and up-to-date, the user community may take photos of the menu and upload it to the site, but it will always be a good idea to take a look at the menu before dinning there.