This cleans repeating code in error callback in settings.
We made a generic function in `ui_report.js` which require two
arguments `xhr` and `btn`; we preferred `btn` over `row` as argument
because a row may have more than one buttons.
Fixes: #8788.
Lets administrators view a list of open(unconfirmed) invitations and
resend or revoke a chosen invitation.
There are a few changes that we can expect for the future:
* It is currently possible to invite an email that you have already
invited, it might make sense to change this behavior.
* Resend currently sends an invite reminder instead of resending the
original invite, this is because 'custom_body' was not stored when
the first invite was sent.
Tweaked in various minor ways, primarily in the backend, by tabbott,
mostly for style consistency with the rest of the codebase.
Fixes: #1180.
Aastha Gupta
Shubham Dhama
snlkapil
Rishi Gupta
Steve Howell
Henrik Pettersson