Filter: bricks/builder/save_messages

add_filter( 'bricks/save_messages', function( $messages ) {
  // Option #1: Add an individual color
    $messages[] = 'Yasss';

  // Option #2: Replace all save messages
    $messages = [
      'Done',
      'Cool',
      'High five!',
    ];

  return $messages;
} );