I just installed 2.2, and the translation feature seems to work (mostly) well.
2 little things I noticed:
* In the beginning (like, first 10 requests in the admin interface after creating a translation), I couldn't go back to English in the little drop-down at the lower-left corner, only French (my first translation language) was available. Now both are there and I can't reproduce the effect of only seeing the alternative language. That seems like a weird bug.
* The translation tool doesn't respect the Accept-Language. Switching with ?lang= works fine and sticks until it's reset again by the same means; but the first request is always served from the default language, not higher-priority languages set in the browser. I think the default until it's set with ?lang= should be according to the Accept-list of the user.
Thanks otherwise for the beautiful software, 2.2 seems much more polished and "production ready" in all regards than earlier releases. Great work!