[QUOTE='Mag[N]uM;5239411']Oh no in option i saw Greek and i don't know where can change back to English,so i am going to learn Greek:dumb:[/QUOTE]
Search for 0C0780(HeX) in the GT5.0 file and change it to 110780. Check if that helps(didn't try but I guess that was the language part).
EDIT:
Some languages I tested. My PS3 language was set to Finnish and some languages might be different with another system language.
Languages with * mark were the ones that I could change ingame. Also if you change to another language you might not be able to go to language settings.
English-----------------------------12
*English----------------------------11
English-----------------------------10
Unfinished DEV?------------------0F
Chinese----------------------------0E
Box Language

----------------0D
*Greek-----------------------------0C
*Turkey----------------------------0B
Poland-----------------------------0A
Russian----------------------------09
Portugal---------------------------08
Holland----------------------------07
Italy--------------------------------06
Germany--------------------------05
Spain------------------------------04
French-----------------------------03
English----------------------------02
English----------------------------01
Japan-----------------------------00