Updated Portuguese translation (pt.json)

This is a translation made by multiple contributors on Wtv1234/popcorn-app-1 fork, a fork dedicated to the Portuguese (Portugal) translation.

Improvements:
Changed indentation to 2 space tabs;
Changed Portuguese language names to identify the country in parenthesis;
Changed words abiding the orthographic agreement for their pre-orthographic agreement equivalents;
Minor changes and improvements;