data in a shorthand field gets displayed in a keywords field.

JabRef version

JabRef 4.0-dev--snapshot--2017-07-19--master--2f12fecfb
Linux 4.8.0-58-generic amd64
Java 1.8.0_131

Steps to reproduce:

1. In biblatex source tab, enter:

@Book{pys,
  title     = {Pātañjalayogaśāstra},
  shorthand = {PYŚ},
}

2. switch to the Optional fields tab

3. looks like the attached image.

It's a bit odd too, because the field data area for "shorthand" doesn't display.