> The provided i18n library is really good, but it lacks tooling around it (like proper extraction of keys, meanings, descriptions, etc..).
Ah, damn, so it hasn't progressed much, if I'm not mistaken. They should really invest in that. I wonder how Google uses it internally, in this case.
Unit testing works flawlessly out of the box with Karma and live reloading, E2E needs a bit of setup, especially if you want to go with Cypress instead of Protractor.
For most use cases its ready to use and for everything else there will almost always be some articles on how to achieve it (i.e. E2E with Cypress).