Luvexina

https://github.com/LeShaps/FPL-History would do the job but doesn't work in Infinity yet.

As an update, that is the approved flag of Mississippi.

There's also https://pspdfkit.com/blog/2018/how-to-program-a-calculator-pdf/ (works in Mobiles, Chrome, Firefox) and https://pspdfkit.com/blog/2019/create-pdf-game-tic-tac-toe-javascript/ (works in a mobile viewer)

There's malicious usage for executables too. Does that mean every system should stop running executables? No, because executables have non-malicious uses too. Same with JavaScript in PDFs. There could be...

Sure, but in the thing I'm distributing it with, those aren't really options. Again, a warning before JS runs would work well.

http://www.eprg.org/pdfcorner/pdfdoodles/ Animated Logo and Progress Monitor here also don't work in SumatraPDF, they just skip to the last one.

It very well could just be an opt-in option, and hide it entirely unless it's accepted in the settings.

I may do this in a fork, then make a pull request.

Well the Transifex was taken down but yes it costs a lot of money. 

However Crowdin has a much cheaper plan