* Change dialog cancel behavior. Stay on screen.

* Switch dialog button.
The "positive" action is always in reference to the dialog's question.
So positive here means to not warn others, while "warn others" is the negative action that cancels the dialog.

* Remove unused code.

* Simplify fragment init.

* LINTs

Co-authored-by: Ralf Gehrer <ralfgehrer@users.noreply.github.com>