I wondered this myself at first.
Is this, perhaps, a problem w/in Kentico then?
We've assigned it 'English -India' and, as you can see from the screenshots, this is created as 'hi-in'.
![Image Text](http://i.imgur.com/rVo1mo1.png)
![Image Text](http://i.imgur.com/SNK5kbE.png)
How would I go about creating 'en-IN' as a language culture to replace the existing one?