About [[Wikia:Forum-header-active-threads/pt-br]]

CLOSED This issue is closed by Nemo_bis

"Active" is an adjective and can follow the available PLURAL as well

It's hard to understand what's part or the code and what should be translated. "Active" also has plural form in Portuguese.

<…> are HTML code and need not be translated.

{{PLURAL:…|…|…}} is a parser function to toggle between singular and plural depending on the first parameter, see mw:Help:Magic words#Localization.