Bug 23713: Subscription add form broken for translations

Bug 23713: Subscription add form broken for translations

This patch makes a change to the subscription entry template as a
workaround to a translation bug which is causing JavaScript errors when
using translated templates.

To test, apply the patch and update and install the de-DE template:

> cd misc/translator
> perl translate update de-DE
> perl translate install de-DE

 - Go to Administration -> System preferences and enable the "Deutsch
   (de-DE)" language under I18N/L10N preferences -> language.
 - Switch to the "Deutsch" translation.
 - Go to Zeitschriften (Serials) -> Neues Abonnement (New subscription)
   and open the browser console. There should be no errors.
 - Links which trigger JavaScript events should work correctly:
   "Lieferant suchen," "Nach Datensatz suchen," etc.

Reported-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Thanks-to: Michael Hoffert and Alexander Arlt from koha-de for reporting
 it initially and figuring out the root of the issue
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>