When the devices register at your server, let them send the Locale. So you can have locale groups of devices and send the messages in according languages.
You can implement that server-side, after GCM registration with the send of token, send also the device locale. And then notify users instantly with a localized message.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.