Modified spanish language file.
Updated languages.
Added @override keyword at some actions and views
Updated to Elgg 1.8.16.
Merge branch '1.8' of gitorious.org:lorea/friendrequest into 1.8

Conflicts:
	actions/friends/add.php
	actions/friends/remove.php
Fixed add and remove friend actions.
Bumped version 1.8.0
Merge branch 'release/1.8.0'