Add the possibility to set confirmation message

Maybe name the new option 'Confirmation message' instead of 'Redirect response', because the latter is an existing technical term and might be confusing. You can see this in the controller, the line below your change contains RedirectResponse :)

Apart from that, looks good! If you can just change that I'll test and merge.

Good point. The merge request is updated. Thanks!

@dieterholvoet i have reviewed the MR!9 Its working perfectly as per issue requirement .
i have attached the Screenshots also. I Move this issue to RTBC.

@prem suthar interesting, you changed the completely wrong setting in issue_review-1.png, but it still resulted in the correct confirmation message in issue_review-2.png? That's some magic!

I actually tested the MR, and all seems to work as expected. Thanks for your contribution @chlandin!