WPML Compability

Hi,

we are using your plugin on a bilingual website.
Problem is, when filling out the form on the German page, the download link in the email doesn’t work.

I am guessing it is because of the /?lang=de attribute. I receive this URL when I click on the link in the email: https://www.trace-gas.com/?lang=de%3Fed%3Ddownload&guid=ujbmgn-icmvnl-dplogi-qzosde-mfgyda–slnqob-otwmla-qgtybi-yrihzv-iobeyu

Please help me out: Is there any way to fix this?

The page I need help with: [log in to see the link]