[Plugin: Feedburner Email Widget] Issue with URL

I have a problem with the URL if I use the locale parameter.

If I paste:

http://feedburner.google.com/fb/a/mailverify?uri=<my uri>&loc=es_ES

in the widget and save, this is converted to:

http://feedburner.google.com/fb/a/mailverify?uri=<my uri>&loc=es_ES

Feedrunner doesn’t like this. If I use

http://feedburner.google.com/fb/a/mailverify?uri=<my uri>

it works OK. But I would like rather use the locale parameter.

Thank you.

http://ww.wp.xz.cn/extend/plugins/feedburner-email-widget/