bugfix for non-english windows installations

"manage.py winfcgi_install" fails on non-english localization, because the users group and the admins group have different (localized) names there.

```
import win32security

def users_group():
	
	# THE BUG
	
	# choose language by commenting
	#users_name='Users' # english
	users_name='Benutzer' # german
	
	explicit_users, domain, type = win32security.LookupAccountName ("", users_name)
	print 'the sid of the user group is %s'%win32security.ConvertSidToStringSid(explicit_users)
	
	# THE FIX
	
	WinBuiltinUsersSid=27 # not exported by win32security. according to WELL_KNOWN_SID_TYPE enumeration from http://msdn.microsoft.com/en-us/library/windows/desktop/aa379650%28v=vs.85%29.aspx
	well_known_users=win32security.CreateWellKnownSid(WinBuiltinUsersSid)
	print 'the sid of the user group is %s'%win32security.ConvertSidToStringSid(well_known_users)
	
	# PLAY SAFE
	
	assert(win32security.ConvertSidToStringSid(explicit_users)==win32security.ConvertSidToStringSid(well_known_users))

def admins_group():
	
	# THE BUG
	
	# choose language by commenting
	#admins_name='Administrators' # english
	admins_name='Administratoren' # german
	
	explicit_admins, domain, type = win32security.LookupAccountName ("", admins_name)
	print 'the sid of the admins group is %s'%win32security.ConvertSidToStringSid(explicit_admins)
	
	# THE FIX
	
	WinBuiltinAdministratorsSid=26 # not exported by win32security. according to WELL_KNOWN_SID_TYPE enumeration from http://msdn.microsoft.com/en-us/library/windows/desktop/aa379650%28v=vs.85%29.aspx
	well_known_admins=win32security.CreateWellKnownSid(WinBuiltinAdministratorsSid)
	print 'the sid of the admins group is %s'%win32security.ConvertSidToStringSid(well_known_admins)
	
	# PLAY SAFE
	
	assert(win32security.ConvertSidToStringSid(explicit_admins)==win32security.ConvertSidToStringSid(well_known_admins))
	
if __name__=='__main__':
	users_group()
	admins_group()
```