Bug 11639: fix untranslatable strings in 007 builder

Bug 11639: fix untranslatable strings in 007 builder

This patch modifies marc21_field_007.tt to make
some missing strings translatable

To test:
1) Using your preferred language, xx-YY, updatepo files
cd misc/translator
perl translate update xx-YY
2) Check that missing strings are NOT present
egrep -i "exact bit depth|pad with zero|use up to 6" po/xx-YY-i-staff-t-prog-v-3006000.po
3) Apply the patch
4) repeat 1)
5) Repeat 2), check that missing strings are present

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

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit d944728a917b5645ef3248e9689638f565388025)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>