It would be nice if we used [`Array#to_sentence`](https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/array/conversions.rb#L57) or the [`support.array` I18n strings](https://github.com/rails/rails/blob/master/activesupport/lib/active_support/locale/en.yml#L32-L36).