Set default encoding of main/resources source folder to UTF-8.

https://github.com/pccampos/pivot4j/commit/a9581b9bfcf890aa393fb082dd1fabc58adee3c8#commitcomment-3975961
Always use en_US locale when running unit tests.

https://github.com/pccampos/pivot4j/commit/91b1bb71b35a931a460bccf596de6e96dbbf7b76
Fix to display a proper message when there's no data available.

(Regression from #53)
Update Brazilian Portuguese translation.

- Contributed by Maiara Lemos of IT4Biz Team(http://www.it4biz.com.br).