Recently a couple people have reported problems with international (or UTF-8) characters. The UTF-8 characters were not being passed correctly from the form on the WordPress site on to Google. I had planned to look into the problem this coming weekend but a wpGForm user (cablop.net) beat me to it and has provided the fix (thank you very much!).
I have incorporated the fix and tested it and was able to submit a couple Spanish words that have UTF-8 characters. The update should appear on your Dashboard shortly.