search: facets

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>
search: tests for facets

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>
search: translations for facets

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>