[FI] editing of invitation e-mails before they are sent

[HeleneLowinger]

[https://gitlab.ccsd.cnrs.fr/ccsd/episciences/-/issues/359]

Message de Slawomir Lasota (FI) I would like to ask about a possibility of a slight extension/modification of the episciences.org platform. When an editor or reviewer is asked by us to take care about a submission, the system automatically sends an invitation e-mail according to the e-mail templates. We would find it very convenient to have a possibility of editing each individual invitation e-mail before it is sent, for instance in order to add some additional information for an editor. Would it be possible to add this feature to the system?

[a3nm]

We would also need this at TheoretiCS for editors. (I think it is already possible for reviewers.)

[a3nm]

By the way, I think this is related to #180