UTF-8 is not an actually encoding we can set, see https://www.b1c1l1.com/blog/2011/05/09/using-utf-8-unicode-on-freebsd/. Use en_US.UTF-8 instead, unless there is a better choice.
Created attachment 175169 [details] madsonic-standalone patch
I'm getting approval for this and I'll submit it.
A commit references this bug: Author: jlh Date: Thu Oct 6 16:04:52 UTC 2016 New revision: 423413 URL: https://svnweb.freebsd.org/changeset/ports/423413 Log: Fix encoding issue. PR: 212995 Submitted by: joshruehlig@gmail.com Approved by: pi Changes: head/www/madsonic-standalone/files/madsonic.in
A commit references this bug: Author: jlh Date: Fri Oct 7 17:20:57 UTC 2016 New revision: 423471 URL: https://svnweb.freebsd.org/changeset/ports/423471 Log: Bump PORTREVISION after previous change. PR: 212995 Submitted by: bdrewery Reviewed by: bdrewery Changes: head/www/madsonic-standalone/Makefile