Index: src/bp-core/bp-core-functions.php
===================================================================
--- src/bp-core/bp-core-functions.php	(revision 11105)
+++ src/bp-core/bp-core-functions.php	(working copy)
@@ -703,7 +703,7 @@
  * @return array
  */
 function bp_core_get_directory_page_default_titles() {
-	return array(
+	$page_default_titles = array(
 		'activity' => _x( 'Activity', 'Page title for the Activity directory.',       'buddypress' ),
 		'groups'   => _x( 'Groups',   'Page title for the Groups directory.',         'buddypress' ),
 		'blogs'    => _x( 'Sites',    'Page title for the Sites directory.',          'buddypress' ),
@@ -711,6 +711,8 @@
 		'activate' => _x( 'Activate', 'Page title for the user activation screen.',   'buddypress' ),
 		'register' => _x( 'Register', 'Page title for the user registration screen.', 'buddypress' ),
 	);
+
+	return apply_filters('bp_core_get_directory_page_default_titles', $page_default_titles);
 }
 
 /**