In the automated import tool, the system uses the default email template, so it is not possible to control or assign templates based on language or custom variables.
As a workaround, you can create an email list in the desired format. Add the first part of the invitation text in Custom 1 column and the second part in Custom 2 column. You can include different languages as needed. Then, go to Compose Invitation, insert ${custom1}, add the survey link, and follow it with ${custom2}
Screenshot: https://prnt.sc/EOOCqYFAdycO
Screenshot: https://prnt.sc/GC1DB_qk31Hy
Help File: https://www.questionpro.com/help/import-email-addresses.html