Add pt-BR translation to Regression lesson (#394)

* start pt-br translation on regression section

* add pt-br translation on tools section of regression lesson

* add pt-br translation on data section of regression lesson

* add pt-br translation on linear section of regression lesson

* add pt-br translation on logistic section of regression lesson

* add syntax and others types of fixes on regression lesson

* add url fixes on regression lesson

* add syntax fixes on regression lesson

* add syntax fixes on regression lesson