Prompt for invite mail to be sent out

[rvschuilenburg]

When hovering over a user with no known PGP key, a tooltip shows "User has no key. Click to invite".
This is a useful feature, but I noticed it will immediately send out an e-mail when you click. It would be better to open up a new e-mail prompt with the invite text as default, so the user is still able to change the contents of the e-mail. It would also make it look more authentic (when I get an automated e-mail inviting me to use some app I immediately assume it was not sent by my friend.)

[MidnightLightning]

👍

[klaszlo]

I just sent out 5 invitations for random people, while I was browsing my emails...