You just have to wait for amazon to fix their software, if they ever will. In the meantime use a USB cable to send books to your kindle.
Filenames are ascii-ized for maximum *robustness*. In your case, aazon's email service has been known to reject email with non-ascii filenames. No one knows exactly what it doesnt like, so calibre errs on the side of safety and just ascii-zes it completely and removes any filename unsafe characters.
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