Complete rewrite of index.pt-pt.json

Complete rewrite of index.pt-pt.json by uncannycod, made from the original English file

The rewrite was made because the original index.pt-pt.json by uncannycod was poorly written and contained Brazilian terms.

This version tries to use a bit more informal language and a richer vocabulary.

I submitted previously 2 similar files because I noticed errors after submitting
Merge pull request #27 from th3m4dm4n/patch-3

Complete rewrite of index.pt-pt.json