From my side, I've been working on a multi-lingual first words book for a baby. None of the published books have our mix of languages (which is fair enough, I don't think there is much of a market for it!) and so I decided to create our own. It's just images and then the word translated into three different languages alongside it (like a typical first words book). I used Google's AI for the images, and it has done a surprisingly good job of creating baby friendly images, with enough detail to spark interest.
The other tangential benefit is that I found it awkward to speak in my mother tongue, but having this book helps break that by having me speak in that language and then leads to it feeling much more natural in other contexts with babies.
This is not very technical project (though if I had the time it could easily become a fun project where people select their unique mix of languages and the book gets produced).
If anybody is in a similar boat and wants to produce their own version for their mix of languages then please let me know and message here - I will happily share the Canva file with you (you'll just need to write in the words yourself). (This idea of sharing is inspired very directly by Derek Sivers 'Sharing' idea [0])