Hi.
Have a look at this support topic where I walk though another user who helped me translate myCRED into Spanish on how to translate the myCRED plugin.
In short, you will need a plugin or software to create a .po and .mo translation files based off the myCRED .pot file.
There are tons of great translation plugins out there to help you out, I personally use Loco Translate but you can go with anyone really.
Once you have translated the plugin, you can send them to me by email (.po and .mo files) along with your myCRED.me username and once your translation is verified and published, you will receive Tokens that you can use on the myCRED website to buy premium plugins as a thanks for your help.