Delete files named localization.txt , localization_mp.txt , and localization_zm.txt .

If is available in the dropdown, select it and Steam will download the necessary files. Change Russian to English: Call of Duty - Black Ops

The primary challenge with installing language patches is version compatibility. Black Ops II received numerous updates over its lifecycle; using an outdated English patch on a newer version of the game can lead to "UI Error" messages or crashes during the loading of campaign missions. Furthermore, Steam users should be aware that "Verifying Integrity of Game Files" will often overwrite the patch, reverting the game back to its original regional language. Conclusion

It is vital to back up existing localization folders to prevent a total reinstallation if a file mismatch occurs.