If Steam refuses to download English, you can force the game to load English text by editing an internal configuration file. This works because the English language assets are often already partially installed with the core game, just not activated.
The English language pack was a massive undertaking, involving thousands of hours of translation, recording, and implementation work. The team worked tirelessly to ensure that the language pack met Treyarch's high standards for quality and accuracy. cod black ops 3 english language pack work