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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.
One of the common pitfalls when using i18n are large translation files size and inability to split them in order to hide parts of your application from prying eyes. Some solutions like Angular built-in implementation are really powerful and SEO compatible but require a lot of preparation and do not support switching languages on the fly in development mode (which was causing troubles at least in version 9); other solutions like ngx-translate require you to install several packages and still don’t support splitting up a single language.