Index: src/bp-activity/classes/class-bp-activity-component.php
===================================================================
--- src/bp-activity/classes/class-bp-activity-component.php	(revision 10586)
+++ src/bp-activity/classes/class-bp-activity-component.php	(working copy)
@@ -260,7 +260,10 @@
 			if ( bp_activity_do_mentions() ) {
 				$count = bp_get_total_mention_count_for_user( bp_loggedin_user_id() );
 				if ( !empty( $count ) ) {
-					$title = sprintf( _x( 'Mentions <span class="count">%s</span>', 'Toolbar Mention logged in user', 'buddypress' ), bp_core_number_format( $count ) );
+					$title = sprintf(
+						_x( 'Mentions %s', 'Toolbar Mention logged in user', 'buddypress' ),
+						'<span class="count">' . bp_core_number_format( $count ) . '</span>'
+					);
 				} else {
 					$title = _x( 'Mentions', 'Toolbar Mention logged in user', 'buddypress' );
 				}