Non-ASCII Characters are inserted as ## in created files' metadata

[Scott]

When the artist or track name includes non-ASCII characters such as éüáèó the characters are correctly used to name the resultant .flac files. However, in the artist and title metadata, those characters show as ## instead of the correct character.

I am using asunder 2.9.1-4 on Xubunutu 17.10.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: asunder 2.9.1-4
ProcVersionSignature: Ubuntu 4.13.0-36.40-generic 4.13.13
Uname: Linux 4.13.0-36-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CurrentDesktop: XFCE
Date: Tue Mar 6 15:13:24 2018
ExecutablePath: /usr/bin/asunder
InstallationDate: Installed on 2015-02-16 (1114 days ago)
InstallationMedia: Xubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
SourcePackage: asunder
UpgradeStatus: Upgraded to artful on 2018-01-10 (55 days ago)