Here is the best information regarding these files and how to apply them:

If you have a region-locked (RU/PL) version, the official repair won't help because English files aren't included in your license. You must manually source and place these files:

Registry Tweak (Critical)

After placing the files, force the game to use English:

• HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\EA Games\Battlefield Hardline

• File names: en_US.sb, en_US.toc, en_US.cas and en_US.cat.
• Typically located in a zip named EN_UK_AUDIO_PACK.zip or BFH_EN_VO_FIX.zip.