This indicates the audio language. The file contains the original Spanish audio track, not dubbed or subtitled into another language. For native speakers or learners, this is a critical marker.
For many fans in Spain and Latin America, the movie gained a second life through releases and cable TV. The Spanish dubbing brought the jokes to a wider audience, making "Celda Bloque 4" a cult title for those who wanted to see the parody version of N.W.A. Is It Still Worth a Watch? CB4 Celda Bloque 4.-Spanish--DVDRip--58
The (a network of organized warez groups) uses strict numbering for releases. A tag like “-58” possibly belongs to a group such as: This indicates the audio language