I've been running into issues with using language variations in Umbraco and Articulate, which is causing all sorts of trouble. I have created an issue over at Github with more details about this, but just posting it here to maybe get some more support as to me it is a blocking error:

https://github.com/Shazwazza/Articulate/issues/340

Hope someone here can help out with this issue as it would be an immense help :)