Resolution: Won't Fix
Affects Version/s: 1.8
Fix Version/s: None
Put following two settings on config.php to use multibyte language file name.
$CFG->unicodedb = true;
$CFG->unicodecleanfilename = true;
When we move a multibyte named file on site file folder, the file name is changed like "____.txt".
This is because php function basename() is not accepted by mulibyte named files.
To fix this problem, it's better to change the function basename() of /files/index.php to original one as below.
$shortfile = preg_replace('/^.+\\\\\\//', '', $file);
Please see index.php.patch for more detail.