First of all let me say GREAT WORK.
Congratulations on the new version!
So far I noticed only one bug and I don't know if that also existed before.
We create many multilingual websites and my problem lies on translatable custom fields.
Everything is fine up to the point the EMAIL order is sent.
Although my custom field gets translated into the website, it doesn't in the email.
Take a look at the attached picture
The language overrides are necessary for backand and frontend. You've your overrides only for frontend.