German: Use post-reform rules

Supported on: At least Windows Server 2008 R2 or Windows 7

Registry

HKCU software\policies\microsoft\shared tools\proofing tools\spelling

Value name: germanpostreform

Enabled: germanpostreform = 1

Disabled: germanpostreform = 0

Allows users to choose a particular spellchecking style; Pre-reform or post reform.