The previous method was giving black screens on the second playthrough so I am posting the correct one here-
1. First install the game from insomni release (change absolutely nothing). The game will install properly, but in French.
2. Then after installing the game, remake the image through PS3gen, but this time with change language files (DEFAULTLANGUAGE and COOKEDLANGUAGE files in COOKEDPS3 folder of the dump, replace FRA with INT in them).
3. Then I put all the BK_XXXXX.INT files (Download these from here-
) in a USB drive, and with multiman, put them in the COOKEDPS3 folder in the game directory of PS3 (HDD0/game/BLES01674-GD/USRDIR/UE3/DISHONORED/COOKEDPS3). There are 669 such files. Basically you need to put them in the COOKEDPS3 folder of the game installation (remember, not in GAMES folder but in game folder. Game is the folder where games get installed. Also, in game folder, there will be two folders pertaining to Dishonored- BLES01675 and BLES01674-GD, put the files in second one. I have shown the path above but I recalled it from memory so it might be a little bit wrong, but you get the idea).
4. Now boot the game with the new image that you made in step 2 (which contains the edited language files).