Removed unsupported setting in vhost config file and added german translation...

Removed unsupported setting in vhost config file and added german translation of welcome email message.

server/conf/mail/welcome_email_de.txt

+From: ISPConfig <postmaster@localhost.localdomain>
+Subject: Ihr Mailaccount ist aktiv.
+
+Ihr Mailaccount ist jetzt aktiv. Viel Vergngen.
\ No newline at end of file

server/conf/vhost.conf.master

@@ -371,7 +371,7 @@
 <tmpl_else>
 	  IdleTimeout 300
 	  ProcessLifeTime 3600
-	  MaxProcessCount 1000
+	  # MaxProcessCount 1000
 	  DefaultMinClassProcessCount 0
 	  DefaultMaxClassProcessCount 100
 	  IPCConnectTimeout 3