Speak, translate, return the phrase
This hack uses Google's language translation service. Py-GoogleTrans is a Python library that translates the text you want to change using Google Translate, for this you will need to be connected the the Internet. Combine this with a USB microphone and Googles Speech to Text API to create a voice translation program. Speak into the microphone, the program converts your phrase into a text string which is then used in the translation, returning the new translated phrase.
Read more at: http://www.tecoed.co.uk/voice-translation.html