Bug 11646: fix untranslatable confirm popup in field 006 and 008 builders

Bug 11646: fix untranslatable confirm popup in field 006 and 008 builders

This patch MARC21 modifies value builders 006 and 008 to make
confirm popup translatable

To test:
1) Update po files for your preferred language, xx-YY
cd misc/translator; perl translate update xx-YY
2) Check that confirm string is NOT present
egrep -B3 "Show values for|material type\?" po/xx-YY*po
3) Apply the patch
4) Repeat 1)
5) Repeat 2), now the strings are present

Also check that english or translated popup is right

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works as described.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>