This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
It really depends on your target audience. Hindi and UK English should cover most people. Actually, IMO, UK English should cover most computer users, but I might be wrong there. Depending on your target audience, you might want to use a local language