Bug 35769: Fix untranslatable strings in request.tt

Bug 35769: Fix untranslatable strings in request.tt

This fixes some strings in the JavaScript part of the
template that were missing from the po files.

This is one way to test:
* Apply patch
* Run gulp po:update --lang <language-code>
* Compare strings changed in the patch, with strings
  appearing in <language-code>-staff-prog.po
* Translate the strings and remove "fuzzy" line
* In k-t-d, run:
  sudo koha-translate --install <language-code> --dev <instance>
* Verify that now the translated version of the template contains
  your translated strings
* Verify the translated page works correctly, no errors

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>