Allow forms to support multiple languages

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Feature request

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I make forms that are used by people who speak different languages. Presently, I need to make a unique form per language. That makes unifying the results manual work.

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I would like to be able to specify which languages I want to support for the form, and be able to provide translations for each element of the form. The user that fills out the form should be able to pick which language they see the form in, possibly based on their browser/preferred language? Being able to append a GET parameter like ?lang=en so that links can be provided to a specific language version would be extra nice.

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Making multiple forms, but then the output is seperate.

The issue does not name files, tests, or an entry point. First map how forms and their elements are rendered and persisted, then define language selection, translations, browser preference, and ?lang=en behavior; done means one form can present translated elements while keeping unified responses.