Welcome the Technical Support section. Help us in assisting you by providing us with a concise and descriptive elaboration of your issues. Be specific and if possible, provide us with a step-by-step instruction in replicating your problem.
You can download the 3rd party Jomsocial language from here
www.jomsocial.com/translations
, but please you make sure install the core Spanish language for your Joomla itself.