I've seen with other languages and the issue for me was the browser. Using Confluence with Internet Explorer (IE10+) passed it through fine.. Might work for you the same. If of course you are using a windows machine/parallels. You could check the Characterset via the browser tools/options - my brain is tired so trying to remember but flick through selecting UTF-8/Western ISO that I think is listed.
It appears to be a known bug:
Are you running Linux (on the Confluence Server)? In that case, you might be able to fix it by installing the necessary fonts. ( /usr/local/share/fonts, if I remember right).
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