* Update pt-BR translations
* Minor updates to translations
* Change "Pull Request" to "pull request".
* Change "Problemas" to "Issues" to keep consistency.
* Change "Propriedade" to "propriedade".
* Change "Wiki" to "wiki".
* Rename "questão" to "issue".
* Update almost all the strings from "[action]" section.
* Added new pt-BR translations