Fix real names encoded with UTF-8

Closes #178.
Use PrivateTmp=yes for the sddm systemd service

See: http://fedoraproject.org/wiki/Features/ServicesPrivateTmp
Merge pull request #181 from eliasp/patch-1

Use PrivateTmp=yes for the sddm systemd service
Merge pull request #179 from plfiorini/fixutf8

Fix real names encoded with UTF-8
Fix last warning as reported in #121

Sometime parent is null, then journald shows a warning here.

I removed the line and saw no regression, then I'm proposing to remove it.
Merge pull request #183 from ilpianista/patch-1

Fix last warning as reported in #121