i18n'ed warning messages when sorting does not occur, and avoided their display in the middle of an XML stream.
i18n'ed warning messages when sorting does not occur, and avoided their display in the
middle of an XML stream.

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