Bug 11508: fix untranslatable pull-down in auth_subfields_structure.pl

This patch replaces occurrences of CGI::scrolling_list with
untranslatable labels. It also fixes capitalization.

To test
1. Go to Administration > Authority types,
click 'MARC structure' of any auth type,
click 'subfields' for any Tag >= 010,
clic 'Edit subfields'

Check pulldowns 'Managed in tab' and 'Select to display or not'

2. Apply the patch

3. Reload and verify functionality of both pulldowns

4. Check that strings are not present on staff PO file
egrep "^msgid \"(Show all|Hide all|ignore)" misc/translator/po/fi-FI-i-staff-t-prog-v-3006000.po

5. Update language file
(cd misc/translator/; perl translate update fi-FI)

6. Check that strings are now present, repeat 4.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>

NOTE: drop-downs work identically. Show all, Hide all, and
      ignore were added to the po files too.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes all tests and QA script.
Works as described and improves the page to manage authority
subfields.

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