@charlyg: Hello there,
I am afraid there is no french translation for Audioman Theme. You will need to translate the theme to french.
To add translation strings first of all you will need to use Poedit software. Install and Open the software.
Create New Translation => Browse and Select audioman-pro.pot file from the languages folder and Click Open => Select the language as French(France).
Now, you will see a list of translation ready strings and Translation textarea where you can add the required translation.
When you are done translating the strings save the file to the languages folder.
Now,Go to => Dashboard => Settings => Select Site Language as Francais and Save Changes.
But I suggest you to create a child theme before doing all this as when you update the theme to the newer version the translation you add will be lost or what you can do is you can translate majority of the strings available for translation and email it to me and I shall add it to the theme itself with your name as the contributor.
Let me know if this helps you out!