Spanish inflectors for rails 3

Spanish.inflectors.txt

ActiveSupport::Inflector.inflections do |inflect|
  inflect.plural /([aeiou])([A-Z]|_|$)/, '\1s\2'
  inflect.plural /([rlnd])([A-Z]|_|$)/, '\1es\2'
  inflect.plural /([aeiou])([A-Z]|_|$)([a-z]+)([rlnd])($)/, '\1s\2\3\4es\5'
  inflect.plural /([rlnd])([A-Z]|_|$)([a-z]+)([aeiou])($)/, '\1es\2\3\4s\5'
  inflect.singular /([aeiou])s([A-Z]|_|$)/, '\1\2'
  inflect.singular /([rlnd])es([A-Z]|_|$)/, '\1\2'
  inflect.singular /([aeiou])s([A-Z]|_)([a-z]+)([rlnd])es($)/, '\1\2\3\4\5'
  inflect.singular /([rlnd])es([A-Z]|_)([a-z]+)([aeiou])s($)/, '\1\2\3\4\5'

# Se agregan inflectores para todos los casos de detalle_ y detalles_
# Ejs.:
# detalle_pendiente_aprobacion -> detalles_pediente_aprobacion
# detalle_rechazo -> detalles_rechazo
  inflect.plural /(\bdetalle)(\w+|_|$)/, '\1s\2'
  inflect.plural /(\bdetalles)(\w+|_|$)/, '\1\2'
  inflect.singular /(\bdetalle)s(\w+|_|$)/, '\1\2'

  # Para evitar errores de pluralización utilizados por formtastic al utilizar i18n
  # (https://github.com/justinfrench/formtastic/blob/master/lib/formtastic.rb#L1850)
  inflect.irregular 'label', 'labels'
  inflect.irregular 'title', 'titles'
  inflect.irregular 'hint', 'hints'
  inflect.irregular 'action', 'actions'
end

Where do I put this? I tried in environments - Development, Production, Test, etc. but nothing, when I try to create a scaffold for pais it says it's already plural an falls to singular pai, it should be paises (plural)

For future reference, you should put this on
config/initializers/inflections.rb
And do not add all these rules if you already built your models with the english inflections, or rails will fail.