the subtitles might have been a bit more necessary if all the on-screen text wasn't in english. That seemed like a strange choice for an ad produced by Google India.
In fact, many kids actually go to schools where English is the primary teaching language - it's not uncommon for kids to not know how to say the days of the week in Hindi.
...And, yes, I just Googled this question and got the answer from Wikipedia.
Not sure about Urdu's status in Pakistan though.