"1. Get the unpacker
http://www.sendspace.com/file/cu6bqm
2. Copy the unpacker to the gamedir\data\win32\packed and drag Dialogs.dv2 to it.
3. After it has unpacked "Sounds" and "Win32" folders,go to sounds\soundbanks\Win32 and rename German to English(US).
4. Get this
http://www.123renamer.com/download.htm so that you don't have to rename everything by hand. Start the program and go to Win32\Characters\Dialogs and just replace everything that has German to English(US).
5. Then use the packer
http://www.sendspace.com/file/x8uyez
6. Take the newly modified "Sounds" and "Win32" that you unpacked to C:\ (I did it this way) and create a new folder for them...for example c:\new and add them to that folder.
7. Then copy the packer to c:\ and start the command prompt(cmd) and add the line like this "dv2_pak.exe -a New\ Dialogs.dv2"
8. After that's done,copy the new Dialogs.Dv2 to gamedir\data\win32\packed replacing the original.
9. Start regedit and go to HKEY_LOCAL_MACHINE\SOFTWARE\[KEYHERE](for me it was Wow6432NODE)\Larian Studios\Divinity2 and change "Language" to English(US)
10. Done. Very Happy"