mongoid/mongoid — pull request #3490 by abrisse (2014-01-15 17:50:44+00:00)
Title: Fix Fields::Localized#lookup to work with boolean

Fix this case:

```ruby

class Property
include Mongoid::Document

field :value, :localize => true
end

p = Property.new
p.value_translations = { fr: false, en: "random" }
p.save!

I18n.locale = :fr
p.value # returns "random" instead of false

```