Add translate pt br

[gilcierweb]

Add Brazilian Portuguese translation, creating all new pt-BR.yml translation files and keys on screens that do not have translation.

[gariasf]

Here @gilcierweb , I'm not sure if this kind of PRs will be merged at the moment.

#1225

[gilcierweb]

@gariasf Hello, how are you?
No problem, I'm translating locally.
I think the idea of ​​the project is very good.
to test locally I'm doing this in config/application.rb

   # config/application.rb
   # TODO: check best model for translate ex: www.example.com/books?locale=pt-BR
    config.i18n.load_path += Dir[Rails.root.join('config', 'locales', '*.{rb,yml}')]
    config.i18n.default_locale = :'pt-BR'`

[zachgoll]

@gariasf thanks for the reference! @gilcierweb as outlined in #1225 we are not accepting this contributions yet.