Thanks.
Before you posted, I managed to extract all the files from the firmware, but unfortunately when I change some strings into japanese (I used a file called LNG editor), They dont work because they arent in the character list, and its impossible to copy every japanese character into the character section. So I won't bother with it.
Now, I've another question xD
With all this amazing editing, which I never thought was possible, I was wondering. I always thought the video player was pretty stupid..no rewind feature..no pause feature etc.. Has anyone made maybe a custom video player for the phone?