My survey has english and german.
each token ( 1048) has EN or DE as a attribute.
Two languages worked for invitation and questions, but I got a huge number of complaints about the language in the reminder-email. The Germans got a german e-mail and the english got the english subject, but the german mail text.
I double checked the reminder e-mail text.
I had no time to ask more customers neither to set up a test environment to reproduce it.
But I will do now. Just for a few englich fake tokens.
My test result for one token manual sending:
It got all as text and subject according to the token language attribute.