user strings not translatable

I've hacked a quick solution which makes the fields translatable (variables module required).

Add the following hook at the end of autoassignrole.module:

/**
* Implements hook_variable_info().
*/
function autoassignrole_variable_info($options) {
  $variables['autoassignrole_user_fieldset_title'] = array(
    'type' => 'text',
    'title' => t('User Role Fieldset Title'),
	'description' => t('The title of the fieldset that contains role options.')
  );
  
  $variables['autoassignrole_user_title'] = array(
    'type' => 'text',
    'title' => t('User Role Title'),
	'description' => t('The title of the field that contains the role options the end user sees during registration.')
  );
  
  $variables['autoassignrole_user_description'] = array(
    'type' => 'text',
	'title' => t('User Role Description'),
	'description' => t('The description displayed to the end user when they are selecting their role during registration.')
  );
  
  return $variables;
}

This enables the three fields for translation via Configuration > Multilingual Settings > Variables
They can then be translated by using Configuration > Variables > Modules > Auto Assign Role