Bug 26339: Move translatable strings out of addorderiso2709.tt into addorderiso2709.js

Bug 26339: Move translatable strings out of addorderiso2709.tt into addorderiso2709.js

This patch moves strings defined for translation in addorderiso2709.tt
into addorderiso2709.js for translation using the new double-underscore
i81n function.

To test, apply the patch and go to Acquisitions -> Vendor -> Basket ->
Add orders from MARC file.

 - Click "Add orders" next to a staged file.
 - Without making any selections, click "Save." You should get an error,
   "There is no record selected."
 - Select a record and click "Save." You should get an error, "Some
   budgets are not defined in item records."
 - Enter a non-numeric value in the "Quantity" field and click "Save."
   You should get an error, "1 quantity values are not filled in or are
    not numbers."

TESTING TRANSLATABILITY

- Update a translation, e.g. fr-FR:

  > cd misc/translator
  > perl translate update fr-FR

- Open the corresponding .po file for JavaScript strings, e.g.
  misc/translator/po/fr-FR-messages-js.po
- Locate strings pulled from
  koha-tmpl/intranet-tmpl/prog/js/addorderiso2709.js for translation,
  e.g.:

  msgid "Some budgets are not defined in item records"
  msgstr ""

- Edit the "msgstr" string however you want (it's just for testing).
- Install the updated translation:

  > perl translate install fr-FR

- Switch to your newly translated language in the staff client
  and repeat the test plan above. The translated strings should
  appear.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>