Add simple "Add EMail" dialog instead of full dlg

Authored by aheinecke on Apr 26 2019, 2:46 PM.

Description

Add simple "Add EMail" dialog instead of full dlg

This dialog only asks for the EMail as identifier
of a new User ID. This matches better to the
UI language of the details widget where the action
is called Add EMail.

To avoid loss of functionality the old dialog is still
accessible though and advanced button.

Details