module ActiveModel::Translation

def human_attribute_name(attribute, options = {})

Specify +options+ with additional translating options.

Person.human_attribute_name("first_name") # => "First name"

instead of "first_name".
Transforms attribute names into a more human format, such as "First name" 
def human_attribute_name(attribute, options = {})
  attribute = attribute.to_s
  if attribute.include?(".")
    namespace, _, attribute = attribute.rpartition(".")
    namespace.tr!(".", "/")
    defaults = lookup_ancestors.map do |klass|
      :"#{i18n_scope}.attributes.#{klass.model_name.i18n_key}/#{namespace}.#{attribute}"
    end
    defaults << :"#{i18n_scope}.attributes.#{namespace}.#{attribute}"
  else
    defaults = lookup_ancestors.map do |klass|
      :"#{i18n_scope}.attributes.#{klass.model_name.i18n_key}.#{attribute}"
    end
  end
  raise_on_missing = options.fetch(:raise, Translation.raise_on_missing_translations)
  defaults << :"attributes.#{attribute}"
  defaults << options[:default] if options[:default]
  defaults << MISSING_TRANSLATION unless raise_on_missing
  translation = I18n.translate(defaults.shift, count: 1, raise: raise_on_missing, **options, default: defaults)
  translation = attribute.humanize if translation == MISSING_TRANSLATION
  translation
end

def i18n_scope

Returns the +i18n_scope+ for the class. Override if you want custom lookup. 
def i18n_scope
  :activemodel
end

def lookup_ancestors

ActiveModel::Translation#human_attribute_name.
ActiveModel::Errors#full_messages and
method, which is used in ActiveModel::Name#human,
When localizing a string, it goes through the lookup returned by this 
def lookup_ancestors
  ancestors.select { |x| x.respond_to?(:model_name) }
end