Works fine on Win 8.1, great conversion.
Single Player only - 2 Languages (English+Your Language) :
1-Install the game. Update game to latest version, apply NO-CD if necessary.
2-Delete Multiplayer Folder.
3-Delete in "SinglePlayer\BMGame\CookedPCConsole" all foreign languages folders not needed except "English(US)" & "YourLanguage".
*
4-Delete in "SinglePlayer\DLC\237619" all foreign languages folders and "LOC_ForeignLanguage.wad"* files not needed.
(Keep "LOC_INT.wad" & "LOC_YourLanguage.wad"
*)
5-In "SinglePlayer\DLC\277830", do the same operation at step 4.
6-Download attachment (pakrat2k2's post), extract to HD, NOT in Gamefolder.
7-Run UltraARC, Browse/Select your installed game, then choose output location.
8-Test the conversion, before burning ISO.
9-Then burn folder contents to DVDs with same folder name.
*Replace "YourLanguage" with your language.
You can delete LOC_INT.wad if you wouldn't English language for the conversion (in "SinglePlayer\BMGame\CookedPCConsole" and "DLC" folders -762Mo each .wad) but it's not enough to fit in 2 dvd5, you have a 3rd dvd in all cases. The game folder without Multiplayer & foreign languages is ~17.5go.
I hope I didn't forget anything.
Final Size :
DVD1 : 4.37GB
DVD2 : 4.37GB
DVD3 : 1.81GB
Decompression's time on my computer (core2duo e6750, 6go ram) : ~40 minutes.
Thx pakrat2k2!