the FTPClient.listFiles() method returns an empty FTPFile[] array if the FTP
server is localized in french. The output of an "ls -l" command is not the same
as in english
french => drwxrwxrwx 5 user group 256 27 jul 14:48 toto
english => drwxrwxrwx 5 user group 256 Jul 27 14:48 toto
The parser gets confused because of the date not being displayed in the same way
("27 jul" vs "Jul 27")