Certain common localized labels can be specified via the stock
tags.  The "text" tag is ignored if the "stock" tag is used.   You
should really use the stock labels rather then just putting all
the translations into the themes.  This gives faster load times
and likely better translations.  The following values are valid:
cancel, _("_Cancel")
caps-lock-warning, _("You've got capslock on!")
chooser, _("_XDMCP Chooser")
disconnect, _("D_isconnect")
halt, _("Shut_down")
language, _("_Language")
ok, _("_OK")
quit, _("_Quit")
reboot, _("_Reboot")
session, _("_Session")
suspend, _("Sus_pend")
system, _("_Actions")  (Formerly "S_ystem")
timed-label,
_("User %s will login in %d seconds")
username-label, _("Username:")
welcome-label, _("Welcome to %h")
For example:
<stock type="welcome-label"/>
