Alt text and title problem with accentuated characters in Image/Link Picker

when you want to display information with accentuated characters :
french é è à
in the ALT of the images or the Title of links
=> characters are changed and not displayed correctly in the backend

see screenshots:

http://www.clipular.com/c/5858343167983616.png?k=oGvDNDFk_3wdUF7bDW6ORJXLe0U

http://www.clipular.com/c/5318761326313472.png?k=2w-NzHMjgXcOIah4l-9Ge9siYn4