Bug 32676: Fix EDI message status case

Bug 32676: Fix EDI message status case

Edifact status appear to vary between all lower case and being
capitalized. This breaks the switch in the edi_status block of the
basket.tt template. We should make this switch case-insensitive.

Test Plan:
1) View the basket for a sent EDI order, note the Sent status does not
   display.
2) Apply this patch
3) Reloate the page, note the status is now visible!

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit b0b33b382c5254db2b4d78ee4d00f03d589513ca)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>