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) : https://space.zeo.net/g/d477

But if I copy paste the url here, I have this url on the site which don't display the image : http://www.wikipower.be/wp-content/uploads/2014/02/Banni%C3%A8re-Bois.png
And this one for the ftp which display the image : http://www.wikipower.be/wp-content/uploads/2014/02/Bannie%CC%80re-Bois.png

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...
:slight_frown: