ترجمة - برتغالية برازيلية-إسبرنتو - o lider é o servo da liderança

I would say "estreco" and not "estraro" because "estraro" means a sum of people "leader", while "leadership" is more conceptual.

The english version uses the word "leadership". "Estraro" does not mean leadership, but something like board of directors or management.
A word for leadership might be "estreco".