There are several reasons why you might need an English language pack for COD Black Ops 2:
Ensure your localization.txt is properly formatted. If it says "russian" or "polish" inside the text file, change it to "english". Is it Safe to Use Language Packs? english+language+pack+for+cod+black+ops+2
(you may need to do this for Multiplayer, Zombies, and Single Player separately). Properties Click on the from the dropdown menu. There are several reasons why you might need