You need en.sb and en.toc files, along with English binary files like GDFBinary_en_US.dll .
Before manual file replacement, try the official route. This works best for Western European or North American versions that might have defaulted to the wrong language during installation. battlefield+hardline+english+language+files+best
Go to your Game Library, right-click Battlefield Hardline, and select Manage > Repair . If your license supports multiple languages, the app will download the missing English files automatically. 2. Manual English Language File Replacement You need en