Bug 29543: (follow-up) Add a warning to SelfCheckoutByLogin

Bug 29543: (follow-up) Add a warning to SelfCheckoutByLogin

This updates the language to warn users of risk if using cardnumber for login and auto-self-check is enabled

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit b32dbaa9cfc43ddd9404a094a2d82c85936c0ba2)
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
(cherry picked from commit 1c0581ba9db486e7479216193654b881de9ac3b2)

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>