Translation of the plugin can be done with language files.
Every JomSocial plugin that contains elements which can be translated, have its own respective language file.
As all plugin, Joomla stores the language files for plugins in administrator folder of the site, so please navigate to
This is the default Joomla language folder for administrative side of site, and unlike modules and components, all plugin related language files will be stored here, regardless if they are active on Front End, or Back End
The filename's that are of interest to us will in most cases have this format
Where pluginname stands for the respective plugin that translation is made for.
Editing these files, you can easily translate every jomSocial plugin.