There are two primary methods to apply an English Language Pack, depending on the nature of the user’s game installation.
Some repack sites claim to offer “easy installers”—be careful with those. Stick to official platform methods if possible.
Launch the game. The text should now be English. If the audio remains foreign, proceed to Method 3.
en-US
To get the working, you generally need to change settings in your game launcher or manually adjust the game's internal configuration files. Many players encounter issues where audio remains locked in a specific language (often Russian) even after changing text settings. Standard Launcher Settings