Captcha field - foreign chars cause exception

[dread]

During registering a user, the user inputs foreign chars into the captcha field.

URL: http://thedatahub.org/user/register
...
Module ckan.lib.captcha:22 in check_recaptcha
<<                                     remoteip=client_ip_address,
                                          challenge=recaptcha_challenge_field,
                                          response=recaptcha_response_field))
           f = urllib2.urlopen(recaptcha_server_name, params)
           data = f.read()
>>  response=recaptcha_response_field))
Module urllib:1267 in urlencode
<<          for k, v in query:
                   k = quote_plus(str(k))
                   v = quote_plus(str(v))
                   l.append(k + '=' + v)
           else:
>>  v = quote_plus(str(v))
UnicodeEncodeError: 'ascii' codec can't encode character u'\xea' in position 0: ordinal not in range(128)

[dread]

Fixed in cset:711a68a12d90 for release 1.5.