Source Reference:

• Component: bbPress :: bbp-admin

  File: /bbp-admin/bbp-replies.php :: Trac Source Line: 530

  		$columns = array(
  			'cb'                => '<input type="checkbox" />',
  			'title'             => __( 'Title',   'bbpress' ),
  			'bbp_reply_forum'   => __( 'Forum',   'bbpress' ),
  			'bbp_reply_topic'   => __( 'Topic',   'bbpress' ),
  			'bbp_reply_author'  => __( 'Author',  'bbpress' ),
  			'bbp_reply_created' => __( 'Created', 'bbpress' ),
  		);
  
  		return apply_filters( 'bbp_admin_replies_column_headers', $columns );
  	}
  
  	/**
  	 * Print extra columns for the replies page
  	 *
  	 * @since bbPress (r2577)
  	 *
  	 * @param string $column Column
  	 * @param int $reply_id reply id
  	 * @uses bbp_get_reply_topic_id() To get the topic id of the reply