node.inc give error if locale not enabled

Issue Summary

If you install this version without "locale" on, you will get an error message about node.inc, line 27 ("locale_language_list" function not defined). I think this is due to locale not enabled and line 27 does not check if locale is on before calling the function. Below if my fix (wrapped the call around a if check statement.

if (module_exists('locale')) {
$lang_codes = array('' => t('Neutral')) + locale_language_list('name');
}