There is the option to save an event when received by Mail. When you try to save it in the calendar, a white window appears with a save button. Clicking that button doens`t do anything though. It apparently is not possible to save events from "normal" mails. Why have the option?

Steps to reproduce:

1. Go to mail with invitation
2. Click the "More" Button in the right upper corner
3. Go to "Save as event"
4. Click "Save" in the Pop-up-Window

Expected result: The dialogue box gives the option to save the event at a selected time and date.
Actual result: Nothing happens.