Update Code to 1.76.1 (#6070)

* Update Code to 1.76.1

- worker-src already contains blob so we can avoid patching that.
- localeService moved.
- Remaining changes were just line changes.

* Make language extensions installable again

Still might want to look into making the native language support work
but for now it seems better not to break backwards compatibility since
the native implementation is quite different.

* Avoid "install in browser" for language packs

It will not work.

* Import correct locale service

I believe before the contributions imported this but now we have to do
it here.