Jira Issue Filter doesn't work when unicode characters are used.

Summary

If you insert an unicode character in the Jira issue filter, Confluence will fail to retrieve the issues from Jira. This happens after publishing the page, but it doesn't happen when you preview the page.

Steps to Reproduce

1. Go to Jira and create a new project called "Não"
2. Go to Confluence and insert a JIM with the following filter:

   project = Não
   

1. Preview the page.
2. Publish the page.

Expected Results

Confluence will display all issues from the project "Não" as it happens on preview.

Actual Results

The following message will appear:

Refresh didn't work. Try again or click an issue to see it in Jira.

Notes

Workaround

1. You can save the JQL query as a filter and then use the JQL "filter = <filter ID>" in the JIRA issue macro.
2. Adding the following to the JVM startup options could fix the issue as well:

   -Dfile.encoding=UTF8