If you are in the lucky situation of creating web pages in English only, then you can skip this chapter completely.
But even if you want to create a web page that uses only one language (other than English), you will need to dive into this chapter. It is not enough to just translate the views. If you use scaffolding, you will still need to take care of the not yet translated validation errors.
I18n.translate or I18n.t: Takes care of inserting ...