Bug 36872: Untranslatable strings in request.tt

Bug 36872: Untranslatable strings in request.tt

There are errors in the JavaScript in the holds template in the staff
client which results in strings not being translatable. This patch
corrects the errors.

To test, apply the patch and run through the process of placing a hold
on multiple items in the staff interface.

- At the hold confirmation step, try to submit the form without
  selecting pickup locations for one or more titles.
- You should get an alert, "Please make sure all selected titles have a
  pickup location set".
- Uncheck the checkboxes next to each title you're placing a hold on.
- Submit the form. You should get an error: "Please select at least one
  title".

- Test the translation process with a language, e.g. fr-FR:
- In KTD, run: gulp po:update --lang fr-FR
- Check fr-FR-staff-prog.po for the line referring to
  koha-tmpl/intranet-tmpl/prog/en/modules/reserve/request.tt:1499
- You should see the string "Please make sure all selected titles have a
  pickup location set".

Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 537c960777f94cf964c757ed2773f330612ae3c7)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>