missing translation in French

[jipehache]

First of all, Eduardo, thank you for your very beautiful theme.

the translation of some command buttons caption is missing ie :

• on the homepage (when not connected) : Enroll instead of S'inscrire
• on the home page (connected) ACCESS COURSE instead of Accéder au cours or Lancer le cours

How can I add this translation without breaking all the job like an elephant in a porcelaine shop.

thank you for your help.

jean-paul