Indian DTH services has many channels with multiple languages: English, Hindi, Tamil and Telugu.
The audio language from English to Hindi, Hindi to Tamil, English to Telugu, English to Tamil can be easily changed in most of thsi DTH.
In TataSky, when viewing the channel just press the green button to change to the language of your choice.
In Airtel Digital TV , press the blue button to change language.
In Dish TV, Press the button with the 
‘speaker mark’ or A LANG button on your remote, the language will change automatically, from English to Hindi / or to the available audio on the channel.
Sun Direct has poor support in this: Press Audio Button in the remote -> from the menu select-Right -> and the language will be English.
Similar options exists for other DTH services: BIG and VideoCon D2H
Airtel is also poor in this bcoz when i press blue button and change it and press ok the language remains same