First Download This RAR File
Install HGL (choose location NorthAmerica)
Install MP 2.0 Patch. Download here if needed
Extract the files from the RAR file you downloaded and copy the following files from it to the DATA folder in your game folder EX:: \Hellgate London\Data
Create a new folder inside the games Language folder named English
EX:: \Hellgate London\Language\English
Place the following file from the English folder in the file you downloaded into the new English folder you created.
Your game should now be converted to English. Launch it and confirm.