I have a website with three languages - English, Japanese and German. The separation works fine. However, I was not able to switch the language selection widget from the Primary (top) Sidebar to the Header Horizontal Widget Area in a side-by-side configuration, despite following the description in the Forum. The languages appeared "stacked" not in line.
Another feature, I would like to have is, being able to apply different WIdget sets to each language. For example, the PayPal payment button with dollars should only appear in the English pages, the Yen-based button in Japanese and the Euro-based button in German. I have tried to use the Plugin "Widget Logic". It appears correctly but does not have any function for the languages. If assigned as suggested by Widget Logic, the widget disappears.
I think this is an important function.