Notify user about incorrect email/pw combination

Right now there's no visual confirmation what went wrong when you can't login.

Steps to reproduce:

  1. Try to log into an application, for example grafana.stackspin.net
  2. Enter wrong credentials

Expected result:

You get an error "wrong username or password"

Actual Result:

The page refreshes and your entered details are gone.

Edited by Maarten de Waard
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