currently there are 6 different email templates saved in the surveys_languagesettings table horizontally
please do something like:

survey_email (id, sid, language, subject, body)
eg:

invitation, 112233, de, 'Invitation Subject', 'Invitation Body'
reminder, 112233, de, 'Reminder Subject', 'Reminder Body'

with defaultIds: invitation, reminder, confirmation, registration, base-notification, ext-notification

so I can simply add my own email templates