You'll need to translate the invite message and set the recipients' Language in the contact list.

https://www.qualtrics.com/community/discussion/comment/30696#Comment_30696Has anyone able to get this to work? I have tried this a few times in multiple times even changing my browser to a different language and no dice. As far as I have been able to confirm multiple languages aren't supported by inline question.

Hi Tom,
Language is on data fields and message is translated however it did not work :(

https://www.qualtrics.com/community/discussion/comment/30964#Comment_30964In that case, you'll probably have to create separate email invite messages for each language, create samples of your contact list based on language, then send invites to each sample.