Translation of the module can be done with language files.
Every JomSocial module that contains elements which can be translated, have its own respective language file.
The module translation files are stored into
This is the default Joomla language folder for the front end of site
The filename's that are of interest to us will in most cases have this format
Where modulename stands for the respective module that translation is made for.
Editing these files, you can easily translate every jomSocial module