The usenet itself is a conglomerate of more than 110,000 so called newsgroups. Their names specify what kind of content they hold. Generally newsgroups are beeing carried as eithertext or binary newsgroups, containing mainly either text or binary data. Also the name of a newsgroup often contains a clue for the main language used in that specific newsgroup.
In the newsgroup alt.binaries.documentaries.french you will mainly french documentary videos.