Removing Nabble links from native-language websites

[mikesaunders]

Hello,

Nabble is no longer working as a web-based front-end to our mailing
lists, so we need to remove/unpublish the links to them. I've done this
already for the EN and DE websites, and for other native-lang projects,
people with admin access to those can remove them.

Typically, Nabble is linked under the translated "Help" menu of the
website, and often in pages about mailing lists.

Thanks!