Hi there,
Are you looking for a hybrid Android app, or a responsive web app? I can do either, and the cost would be similar, perhaps a bit higher for a hybrid android app.
Can't say my bid is final yet, as I know too little about the project requirements. I understand the idea of character conversion/translation, eg. cyril to latin, arabic to latin, greek, etc... all could be converted between each other. In some cases there is no equivalent for the letter, for example in Serbian we have a letter š (and a few other letters) that do not exist in English alphabet for example, but could be closely produced by 2 characters, for example the above letter would be best translated to English as "sh".
I hope I am close to understanding your idea, but I'm sure there is more to it, so I hope that you can provide a bit more details so that the scope of the project is fully defined before we start.
Regards,
Julijan