Using timezone Europe/Oslo causes firewall/system logs to be displayed in UTC
When configuring pfSense with timezone 'Europe/Oslo', the time shows correctly in the dashboard. The firewall/system logs are however shown in UTC time. Changing the timezone to for instance 'Europe/Copenhagen' follwed by a reboot resolves the issue.
Teach system_timezone_configure() to deal with symlinks to avoid having timezone misconfigured. This fixes #3293