Plain text file attachment are not marked with the correct character encoding when retrieved.

We have an attachment written in Norwegian (which means it contains non-English characters such as æøå and ÆØÅ). If I look at the attachment on the server using 'vi', it is displayed correctly. If I look at it on the server using 'more', it is displayed incorrectly. When retrieved through Jira's web interface, it is displayed incorrectly by the browser. However, if I manually change the character encoding in the browser from UTF-8 to ISO-8859-1, the attachment is displayed correctly.

Is there something we can do/configure to get the character encoding correctly out to the browser by default?

I will attach two screenshots, the default shown in Jira and the one shown when manually overriding to iso-8859-1.