I found a way to fix the keyboard problem!
open titanium backup.
go to back-up/restore
scroll down until you see in samsung-keyboard(in your own language, mine is dutch so it exactly is: samsung-toets.rd 4.0.3-xwlp2)
click it once and make a backup.
after your backup is done click it again and delete it.
now you are able to select the keyboard you like in your setting.
you can restore your backup if you want. after restoring you can keep changing your keyboard.
and thats it
Samsung Galaxy S II i9100