Add extra maintainer for organisation

Organization pages do not have maintainers/co-maintainers. There is only the node owner, who can edit the organization node.

@avpaderno fair enough. Can the ownership of https://www.drupal.org/blackbird → be transfered from my account to https://www.drupal.org/u/mathijs_blackbird → ?

I changed ownership as requested.

Thanks!

Automatically closed - issue fixed for 2 weeks with no activity.