Description of problem:
If one tries to overwrite an image in a localized Desktop directory,
the warning dialog shows the name in the filepath as a utf-8 byte stream
not the native name.  Not sure if it is a "feature" but it looks ugly.

How reproducible:
every time

Steps to Reproduce:
1. login to a new desktop account in Japanese say.
2. Press PrintScreen and save screenshot.
3. Take another screenshot and try to overwrite the first one.
  
Actual results:
3. Dialog with utf8 byte stream.

Expected results:
3. UTF-8 filepath to appear in native characters.

Additional info:
Passing the filename to a shell gives "No such file or directory".
(It would be better not to translate the names on disk IMHO but that is
another story.)