Apply Operating System English
Apply Operating System French
Apply Operating System Dutch
Use an unattended or Sysprep answer file
-> PKG_Win8.1_Unattend_NL
—> Unattend.xml

Apply Language EN (OSLanguage equals “EN”)
Apply Language FR (OSLanguage equals “FR”)
Apply Language NL (OSLanguage equals “NL”)
-> Apply NL Language Pack
—> cmd /c dism.exe /online /add-package /packagepath:lp.cab
—> Package: PKG_Microsoft_LanguagePack_Win8.1_01.00_NL -> lp.cab
-> BCDEdit to NL
—> cmd /c bcdedit /set {current} locale nl-NL
-> BCDBoot to NL
—> cmd /c bcdboot %WinDir% /l nl-NL
-> Remove EN-US
—> cmd /c reg delete HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MUI\UILanguages\en-US /f
-> Restart Computer