WebSearch: translate advanced search sort fields
WebSearch: translate advanced search sort fields

* When generating cache of advanced search pages with webcoll,
  internationalize the sort-by-field menu.

inveniosoftware/invenio-records,tiborsimko/invenio-search,inveniosoftware/invenio-search,tiborsimko/invenio-records,inveniosoftware/invenio-search,tiborsimko/invenio-records,tiborsimko/invenio-search,inveniosoftware/invenio-records