You have me beat xD
You can always do it manually? Open your pack files, rename lang0 to something in case u messup, then from the english patch files copy and paste the file "lang0" into the DBO pack folder.
the pack folder should be under localize>taiwan>pack or netmarble>dragonball online>pack
Look at my post? really all u have to do is rename the old file, drag the new one in. and when u open the launcher click the first button in the grey side bar.