I didn't find the solution to do it, but I know now why I c'ant do it !
Thanks to Phildu91.
You can't change the notify.dll.090C.mui if you have an official HTC rom, the file is in readonly, system, inrom if you ckeck the propreties in TC. So you can't rename it, copy it, delete it !
The solution would be to ask the system to use the notify.dll.09409.mui instead. I tried to look in the registry but I found nothing.
Bye.