Bug 32701: Fix I18N JavaScript libraries on self checkout help page

The help page was missing the fixes from bug 28488. The missing
libraries are causing a JavaScript error on the page and likely
other issues.

To test:
* Make sure WebBasedSelfCheck is activated and configured
  Note: In ktd you don't need to configure anything, it's already set up.
* In the OPAC, go to:
  /cgi-bin/koha/sco/sco-main.pl
* Click on the link to the help in the top right corner
* Verify you see the error in the console:
  jQuery.Deferred exception: __ is not defined
* Apply patch
* Restart things
* Reload the page
* Veriy the errors are gone

Signed-off-by: David Nind <david@davidnind.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 289f0e8051)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

koha-tmpl/opac-tmpl/bootstrap/en/modules/sco/help.tt

@@ -2,6 +2,7 @@
 [% USE Koha %]
 [% USE Asset %]
 [% USE KohaDates %]
+[% PROCESS 'i18n.inc' %]
 [% INCLUDE 'doc-head-open.inc' %]
 <title>Self checkout help &rsaquo; [% IF ( LibraryNameTitle ) %][% LibraryNameTitle | html %][% ELSE %]Koha [% END %]</title>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
@@ -12,8 +13,14 @@
 [% IF ( Koha.Preference('OPACUserCSS') ) %]<style>[% Koha.Preference('OPACUserCSS') | $raw %]</style>[% END %]
 [% IF ( SCOUserCSS ) %]<style>[% SCOUserCSS | $raw %]</style>[% END %]
 <script>
+    var Koha = {};
     function _(s) { return s } // dummy function for gettext
 </script>
+[% IF lang && lang != 'en' %]
+    [% Asset.js(lang _ '/js/locale_data.js') | $raw %]
+[% END %]
+[% Asset.js('js/Gettext.js') | $raw %]
+[% Asset.js('js/i18n.js') | $raw %]
 </head>
 <body id="sco_help" class="sco">
     [% INCLUDE 'masthead-sco.inc' %]