class ActionView::Helpers::FormBuilder

def submit_default_value
  object = convert_to_model(@object)
  key    = object ? (object.persisted? ? :update : :create) : :submit
  model = if object.respond_to?(:model_name)
    object.model_name.human
  else
    @object_name.to_s.humanize
  end
  defaults = []
  defaults << :"helpers.submit.#{object_name}.#{key}"
  defaults << :"helpers.submit.#{key}"
  defaults << "#{key.to_s.humanize} #{model}"
  I18n.t(defaults.shift, model: model, default: defaults)
end