This usually means there's an issue with your environment using the wrong language or collation. Generally, start at https://confluence.atlassian.com/jirakb/jira-application-internationalisation-and-encoding-troubleshooting-203394762.html
It's no answer. I use russian language, and all symbols displayed - ???. It's only in headers. Another text is correctly (see screen). I had this problem some years ago but i don't remember where in community find answer for cyrillic.
P.S. Sorry for my bad English.
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