BibFormat: better escape BFE in admin test UI
BibFormat: better escape BFE in admin test UI

* Escapes values of BFE parameters in BibFormat admin test interface
  for BFE. Escapes BFE names as well.

inveniosoftware/invenio-formatter,tiborsimko/invenio-formatter,tiborsimko/invenio-formatter,tiborsimko/invenio-formatter,inveniosoftware/invenio-formatter,inveniosoftware/invenio-formatter