I saw many people in internet asking how to change logon/logoff text. Use reshacker, go to system32. Open the winlogon exe. Than openstring106. Change1682 "Benutzereintellungen werden geladen" to "Willkommen". Change1684 "Windows wird heruntergefahren" to "Herunterfahren..." Delete1687 "Einstellungen werden gespeichert". Now you have the same text as in Vista. Anyway, you can write what you want. But be carefull with this exe, it contains your activation data.
Will also function in other languages, maybe the string number is a little different.