fix slugifier: iconv doesn't work as aspected when locale is C or POSIX, see http://www.php.net/manual/en/function.iconv.php
Merge branch 'fix_slugifier' into 2.2

* fix_slugifier:
  fix slugifier: iconv doesn't work as aspected when locale is C or POSIX, see http://www.php.net/manual/en/function.iconv.php