I have reviewed your setup and its all correctly configured. I would identify this as a WPML bug, could you report this in the WPML support forum where they will be able to give you better assistance for this problem?
This is what I found (simply by chance really!). The links you created had this href: /en/xxx/ by removing the first / before en so that the href becomes: en/xxx I can see that the sidebar widgets display in English as expected.
This works indeed. Before I updated views this was no problem. It is still weird.