There are several different variations out there. The major ones are fan based and the BBC has not, yet, released an official version. These fan version have been created using the Gallifreyan from various episode, as inspriation.
The first one, will go on a T-Shirt. The second will go on an etched silver cuff I will make in a few weeks.
I am not translating them for you. Do the research and see if you can find the different systems I used. THEN you can start to translate them.