Related is Prismatext, which intermixes the new language into the text of a book in your native language, so you get in-place, contextual learning of the new language:
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I built something like this for my own personal language studies about a decade ago called "Kindle Swap". You fed it an ebook in ePub/MOBI format along with a list of known vocabulary and it would sprinkle them into the book so you could read it on your Kindle at your leisure later.
This seems useful for related languages, but even then I wonder whether it is a good idea to blur the lines required for code switching.