Source Reference:

• Component: bbPress :: bbp-admin

  File: /bbp-admin/bbp-forums.php :: Trac Source Line: 397

  			'cb'                    => '<input type="checkbox" />',
  			'title'                 => __( 'Forum',     'bbpress' ),
  			'bbp_forum_topic_count' => __( 'Topics',    'bbpress' ),
  			'bbp_forum_reply_count' => __( 'Replies',   'bbpress' ),
  			'author'                => __( 'Creator',   'bbpress' ),
  			'bbp_forum_created'     => __( 'Created' ,  'bbpress' ),
  			'bbp_forum_freshness'   => __( 'Freshness', 'bbpress' )
  		);
  
  		return apply_filters( 'bbp_admin_forums_column_headers', $columns );
  	}
  
  	/**
  	 * Print extra columns for the forums page
  	 *
  	 * @since bbPress (r2485)
  	 *
  	 * @param string $column Column
  	 * @param int $forum_id Forum id
  	 * @uses bbp_forum_topic_count() To output the forum topic count