PT-BR "Stateful Components" article missing some pieces

[AnnyFigueira]

The following pieces are not mentioned in the PT-BR version of this article ("Components com estado"):

Stateful components are classes that extend nullstack and are able to hold state that reflects in the ui.

Events array

Debounced Events

TypeScript

Inner components

The following are outdated in the PT-BR version:

• Event Context section: everything is outdated at "Contexto de Evento"