fixup! c2e1f22 reject translations that are not available

Bleeerrghhh. Only select translations that are available for admin
public body form. Not sure if it can happen in production but if e.g.
you change the AVAILABLE_LOCALES it tries to sort existing translations
by the new AVAILABLE_LOCALES and fails because the key no longer exists.

app/views/admin_public_body/_form.html.erb

@@ -4,7 +4,7 @@
 
 <div id="div-locales">
   <ul class="locales nav nav-tabs">
-    <% @public_body.translations.sort_by{ |t| I18n.available_locales.index(t.locale) }.each do |translation| %>
+    <% @public_body.translations.select{ |t| I18n.available_locales.include?(t.locale) }.sort_by{ |t| I18n.available_locales.index(t.locale) }.each do |translation| %>
       <li>
         <a href="#div-locale-<%= translation.locale.to_s %>" data-toggle="tab">
           <%= locale_name(translation.locale.to_s) || _("Default locale") %>
@@ -14,7 +14,7 @@
   </ul>
 
   <div class="tab-content">
-    <% @public_body.translations.sort_by{ |t| I18n.available_locales.index(t.locale) }.each do |translation| %>
+    <% @public_body.translations.select{ |t| I18n.available_locales.include?(t.locale) }.sort_by{ |t| I18n.available_locales.index(t.locale) }.each do |translation| %>
       <% if translation.locale.to_s == I18n.default_locale.to_s %>
         <%= fields_for('public_body', @public_body) do |t| %>
           <%= render :partial => 'locale_fields', :locals => { :t => t, :locale => translation.locale } %>