Recording contact language through survey take

Hi!
I have a directory full of contacts, but I don't have the language registered for them. Is it possible to save the language value when they are taking a survey (without directly asking the language from the respondents)? I guess I should be using embedded data but somehow I cannot manage to do it. Additional info, I am sending out the survey via email from Qualtrics but I also use the anonymize response function.

Thanks for your help!