Yea...Angular made a huge (and hardly documented) change to their internationalization library that forced us to migrate to a third-party one.

Basically, they now (as of Angular 12) force you to build a difference version of your app for each language you support, and either serve them up at different URLs or use cookies to serve up the right version to each user. The technical reasons make sense...your translations occur at build-time, rather than at run-time, but it's a pretty drastic change that occurred out of nowhere.

Not a fan.