On older consoles (PS3/Xbox 360), languages were stripped to fit the limited disc capacity. Digital Downloads:

Jonathan Irons’ fate was never confirmed. Some say he retreated to an orbital platform, speaking only Vox Nihili to a crew of lobotomized synthetics. Others say he was torn apart by his own guards when they suddenly remembered the names of their children in Vietnamese, Swahili, and Urdu.

This isn’t just a Call of Duty issue. The same happened with Metal Gear Solid V , The Witcher 3 , and Destiny — region-locked language DLC that vanished without warning.