We were very inconsistent regarding these rules.
Personally I prefer no empty lines around blocks, clases, etc... as
recommended by the Ruby style guide [1], and they're the default values
in rubocop, so those are the settings I'm applying.
The exception is the `private` access modifier, since we were leaving
empty lines around it most of the time. That's the default rubocop rule
as well. Personally I don't have a strong preference about this one.
[1] https://rubystyle.guide/#empty-lines-around-bodies
Instead of using I18n for the field texts and forcing the
locale (e.g. `I18n.t('seeds...', locale: :es)`), I'm moving
content out of `config/locales/` and into the seed file.
This is because this content is less about reacting to different
locales (the locale would always be forced so we don't actually
use the main i18n functionality), and more about demonstrating
the "translatable fields" feature.
