Fix: Issues with International Characters like german umlaut

[RudolfAchter]

Fixes issue with german Umlauts (and other non english characters) when using in strings in Set-nbObject and New-nbObject.
For example like this

$nbVMObject= New-Object -Type PSObject -Property @{
	name="VMName"
	status="active"
	site="Datacenter in Brühl"
	cluster=1
	role=1
	vcpus=2
	memory=1024
	disk=10
	comments="Beschreibung für ein deusches System mit deutschn Umlauten äöüÄÖÜ"
}

New-nbVirtualMachine -Object $nbVMObject