Looking for some help

I want to develope a translator from dinosaur to english (it is from a videogame, the language is basically replace a letter for another)
example:
DOG
TEW

Is it possible to “translate” the text from a text box by replacing the letters?

https://groups.google.com/forum/#!msg/mitappinventortest/vFM0vJG1V2A/3fHI7sKZCAAJ