search: facets unicode error fix

Signed-off-by: Esteban J. G. Gabancho <esteban.gabancho@gmail.com>
installation: workflow>=1.2.0

* Upgrades required workflow package version to 1.2.0. (addresses #1797)

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
installation: WTForms, Flask-WTF>=0.10.2

* Unpins WTForms maximal version since Flask-WTF supports its latest
  version since 0.10.0 release.

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>