The language(s) of a document are only visible when there is a value in the 041 field. Since this field is intended for multilingual/translated/etc. resources, and for other/unilingual resources the language information is typically just encoded in 008_35-37, the language of a document is often not displayed on OPAC. The language field shown in the bibliographic record preview (on the search results page) and in the detailed bibliographic record should instead display: 041$a 008_35-37 (if there is no value in 041) This should apply to both the OPAC and the intranet.