Images with accent don't display after site migration and importation

Hi !

I've just migrated a Wordpress site and I have a big problem with the images that have accent in their url. They don't display at all but they are on the FTP.

Example of an image :
One the site and on the ftp, this is the url (screenshot) :

But if I copy paste the url here, I have this url on the site which don't display the image :
And this one for the ftp which display the image :

So the "è" is transformed to "%C3%A8" on the site and to "%CC%80" on the http://ftp... Why ? What can I do ? And it's not the only accent that is broken...