Add handle_extensions to get Spree.translations (archaic spree js translations) in handlebars templates

This is all legacy from spree that can be cleaned up at some point, we only have two handlebars templates in OFN

app/assets/javascripts/admin/all.js

@@ -34,7 +34,7 @@
 //= require css_browser_selector_dev
 //= require responsive-tables
 //= require admin/spree_paypal_express
-//= require handlebars
+//= require admin/spree/handlebar_extensions
 
 // OFN specific
 //= require_tree ../templates/admin

app/assets/javascripts/admin/spree/handlebar_extensions.js

@@ -0,0 +1,9 @@
+//= require handlebars
+
+Handlebars.registerHelper("t", function(key) {
+  if (Spree.translations[key]) {
+    return Spree.translations[key]
+  } else {
+    console.error("No translation found for " + key + ". Does it exist within spree/admin/shared/_translations.html.erb?")
+  }
+});

app/views/spree/admin/shared/_translations.html.erb

@@ -6,7 +6,7 @@
     :abbr_day_names           => I18n.t(:abbr_day_names, :scope => :date),
     :add                      => Spree.t(:add),
     :are_you_sure_delete      => Spree.t(:are_you_sure_delete),
-    :bill_address             => Spree.t(:bill_address),
+    :bill_address             => I18n.t(:bill_address),
     :choose_a_customer        => Spree.t(:choose_a_customer),
     :confirm_delete           => Spree.t(:confirm_delete),
     :cut                      => Spree.t(:cut),

spec/javascripts/application_spec.js

@@ -14,6 +14,7 @@
 //= require textAngular.min.js
 //= require moment/min/moment.min.js
 //= require i18n
+//= require handlebars
 
 angular.module('templates', [])
 angular.module('uiGmapgoogle-maps', []);