[WIP] [RFC] Product translation (Prezent)

This is a second approach using Prezent, please look at issue #2018
@pjedrzejewski That's easy to do, but then the translated sentences are hardcoded on the fixtures, so the result would be weird: Imagine the user has 'en' and 'de' defined, fixtures would be loaded as 'de' and when displaying the 'de' language on the frontend the text would be spanish.
I'm going to modifify this so that it uses the configured locales, but for later we will need an easy way of defining the hardcoded words and sentences in order lo get fixtures in different languages.