@ Enn
Oh, sorry, I mis-read that!
See this WordPress doc page to setup WordPress in another language:
http://codex.wordpress.org/Installing_WordPress_in_Your_Language#Manually_Installing_Language_Files
This is what you need to add to the wp-config.php
file for Spanish:
define ('WPLANG', 'es_ES');
If I remember correctly … in order for the Spanish translation to be used in Connections, the Spanish translation must also be set up and properly configured for WordPress…
If you do not have the MO/PO file for WordPress (not Connections) you can download them from here:
http://i18n.svn.wordpress.org/es_ES/trunk/messages/es_ES.mo
http://i18n.svn.wordpress.org/es_ES/trunk/messages/es_ES.po
I might be easier for you to use this plugin instead to setup Spanish for WordPress:
http://wordpress.org/plugins/wp-native-dashboard/