uploader can't handle filename with non-english characters

[gamerhk]

When i upload a file with chinese filename (圖像006.jpg), the file is saved as

%e5%9c%96%e5%83%8f066.jpg

in the file system.

However, when wordpress tries to load the pic, it shows the image as

http://mydomain/path/%e5%9c%96%e5%83%8f066.jpg

rather than

http://mydomain/path/%25e5%259c%2596%25e5%2583%258f066.jpg

which causes a 404

[filosofo]

duplicate of #5587