NLHA

The bug tracker is currently 'closed' and is only open when there is a new beta (or even new features?) being introduced, from what I've been able to figure out.
When it's not available, the best option is what @opentype said...
 

You should open a support ticket with IPS. 

That is intentional. 
He/she can only join again with an invite. 

Clubs?
You would need to change every language string containing “club(s)”. There are a couple of pages.