Add a custom backlink for the completion events

[westermannlab]

Hello Yury,
for the completion of an assessment to be processed by Samply, one has to send participants to a link like https://samply.uni-konstanz.de/studies/{yourstudycode}/done/{messageid} . Then, however, the participant sees the Samply website as final page.
It would be nice to be able to specify an URL for another redirect to custom final page:

Samply app--> (qualtrics|unipark|limesurvey) --> Samply website --> Final page ( e.g.. https://study-website.com/thanks.html )

Thanks for considering this feature request,
best wishes,
Stefan