модуль ActionView::Helpers::TranslationHelper

# File actionview/lib/action_view/helpers/translation_helper.rb, line 87
def localize(*args)
  I18n.localize(*args)
end

# File actionview/lib/action_view/helpers/translation_helper.rb, line 38
def translate(key, options = {})
  options = options.dup
  has_default = options.has_key?(:default)
  remaining_defaults = Array(options.delete(:default)).compact

  if has_default && !remaining_defaults.first.kind_of?(Symbol)
    options[:default] = remaining_defaults
  end

  # If the user has explicitly decided to NOT raise errors, pass that option to I18n.
  # Otherwise, tell I18n to raise an exception, which we rescue further in this method.
  # Note: `raise_error` refers to us re-raising the error in this method. I18n is forced to raise by default.
  if options[:raise] == false || (options.key?(:rescue_format) && options[:rescue_format].nil?)
    raise_error = false
    i18n_raise = false
  else
    raise_error = options[:raise] || options[:rescue_format] || ActionView::Base.raise_on_missing_translations
    i18n_raise = true
  end

  if html_safe_translation_key?(key)
    html_safe_options = options.dup
    options.except(*I18n::RESERVED_KEYS).each do |name, value|
      unless name == :count && value.is_a?(Numeric)
        html_safe_options[name] = ERB::Util.html_escape(value.to_s)
      end
    end
    translation = I18n.translate(scope_key_by_partial(key), html_safe_options.merge(raise: i18n_raise))

    translation.respond_to?(:html_safe) ? translation.html_safe : translation
  else
    I18n.translate(scope_key_by_partial(key), options.merge(raise: i18n_raise))
  end
rescue I18n::MissingTranslationData => e
  if remaining_defaults.present?
    translate remaining_defaults.shift, options.merge(default: remaining_defaults)
  else
    raise e if raise_error

    keys = I18n.normalize_keys(e.locale, e.key, e.options[:scope])
    content_tag('span', keys.last.to_s.titleize, :class => 'translation_missing', :title => "translation missing: #{keys.join('.')}")
  end
end