Bug 13357: Untranslatable strings on itemsearch.tt

Bug 13357: Untranslatable strings on itemsearch.tt

This patch enable translation of labels on itemsearch.tt

To test:
1) Translate for a fairly complete language (es-ES de-DE)
2) On staff, go to Search > Item search
3) Check there are many untranslated strings
e.g. Text before pulldowns on first and second box
     All options on third box

4) Apply the patch

5) Repeat 1 & 2
6) Check there are now some strings translated
7) Update translation file, check there are some
new strings to translate (may be they are fuzzy)
e.g. "All statuses", "All collection codes"

Patch works as expected.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>