Repeat this for localization_mp.txt and localization_zm.txt if they exist. : Go to the sound folder.
While there is no "official paper" from Activision on this, the most useful guides for applying an English language pack to Call of Duty: Black Ops II english language pack for cod black ops 2
Commonly used sources include the Steam Community Guide or safe community-verified mirrors on Google Drive . Always verify files with an antivirus before installation. Repeat this for localization_mp