Why replacement character occur ?

sebul <[email protected]>
Newsgroups gmane.linux.debian.devel.www
Message-ID <CANy4eeVXn4siM1SWOoL6JUTJ2ZFchmh5G-dc8+QX+amda+k+OA@mail.gmail.com>
Hello.
https://www.debian.org/social_contract.ko.html
shows replacement characters.
For example
 데비안 자� 소프트웨어 지침에
But when I see social_contract.wml I can't find replacement charcter �

Why replacement character occur? How can fix it ?

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