I've seen this a few times. Could you work through the stuff in https://confluence.atlassian.com/jirakb/jira-application-internationalisation-and-encoding-troubleshooting-203394762.html
I found we also had to clear out the Tomcat temporary directories after correcting one of the encoding settings as well to get it to work.
Thank you very much for your help.
I confirmed this page(JIRA Application internationalisation and encoding troubleshooting) and tried each resolution. I’m sure the same encoding(UTF8) is used.
but, There is still garbled problem.
I also found 'user.language : en' from "/opt/atlassian/jira/logs/catalina.out". I don't know how to setting.
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