Update pt.json

Overall improvements:
- Corrected indentations;
- Translated some foreign terminologies;
- Added and translated missing bit from "UpgradeVersionDescription" parameter;
- Added missing languages;

Removed:
- Removed the translation for the settings page because I didn't find those lines in any language file in any branches of the original repo, maybe I didn't search in the right place.

P.S: This is also my first time using github, I'm still a bit confused :)