Template translation (WP Fan Zone Theme)

Hi all,

As many ppl over here, I am also new on developing my own website based on WP templates.
I would like to know , what is the best way to translate the hard-coded things on the template from English to Portuguese?
For instance:

*Date on the up-left corner> https://www.conexaoamsterdam.com.br/

*Leave a comment box> https://www.conexaoamsterdam.com.br/onde-comer-em-amsterdam-coffee-bru/

*And also something that appear in every post “Posted By Conex?o Amsterdam on February 6, 2015”

Thanks a lot for your help,
Hugo