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translation-check
This package shows an overview of your translations. Check which keys are not yet translated.
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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.
The engineering team should commit to adding new translation keys for one locale. In this case, let's assume en-US for the sake of this example. As the engineers are working, they will add copy to the locales/en-US.json file and carry on with their work. When they open a pull request for their work upstream to their development environment, a script can run in CI that will check for newly-created keys that aren't present in all the supported locales and notify the appropriate translators that your branch needs translation work. Alternatively, you could consider a tool like translation-check, which will create a simple dashboard where you can get an overview of missing translations by locale.
While I believe there is a lot of valid criticism for using a library for everything in the JavaScript ecosystem, I strongly believe this is a case where you want to put your trust in the experts of the open-source community. The most common library I've seen for serving translations in a React app is react-i18next.