url with portuguese caracters

When I put words with “~” or “ç” on the title, the auto url_title generator replace the letter by “ae”

look to the link or the attachment

http://www.surfcrew.com.br/cultura-urbana/simpsons-dara-sua-contribuicaeo-aos-brasileiros-em-episodio-especial

Where “contribuicaeo” is “contribuição”