tour: confusing translation in PT-BR version

[jabotaro]

Context: https://go-tour-br.appspot.com/basics/1

At this page in the English version, there is this text line:
(To see a different number, seed the number generator; see rand.Seed. Time is constant in the playground, so you will need to use something else as the seed.).

The translation of this phrase to PT-BR is slightly wrong and is missing parts, which can lead to confusion for people who only speak portuguese.

At the portuguese version, you read (Para ver um número diferente, a semente do gerador de números; veja rand.Seed.) - which does not make much sense to be honest.

I would suggest changing it to something like (Para ver um número diferente, troque a semente do gerador de números; veja rand.Seed. O tempo é constante no playground, então você precisará utilizar algo diferente disso como semente.). This way I think it will be more understandable.