Besides some fixes and improvements, another important addition is the ability to filter files and folders on the server, so by default all .* files are hidden, and it's possible to customize the filters so that it matches your needs.
With regards to the localization, in 1.2 there are four languages included (besides English): German, Italian, Polish and Spanish, but if you need to add another language you just have to follow the localization guide for CKFinder.
Of course, if you create any such translation the recommended procedure is to send it back so it can be added for the rest of the people and you don't have to worry about how to update it with any new version.
I hope that all of you enjoy this version.