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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
7) I don't really use translation add-ons so don't think I could be of help you with this, sorry. There's an add-on listed on the official add-ons site called BabbleOn, but I think that only just redirects websites to their Google Translated version. Note though that if you can't find an add-on that suit your needs, there's always the option of using the Classic Add-ons Archive to search for the add-on that does. Anyway, I'd like to address the following: