Fix duplicate fields in information texts form

We were rendering the same hidden field, with the same HTML ID, one time
per enabled locale.

app/components/admin/site_customization/information_texts/form_component.html.erb

@@ -7,6 +7,7 @@
   <% contents.each do |group| %>
     <% group.each do |content| %>
       <b><%= content.key %></b>
+      <%= hidden_field_tag "contents[content_#{content.key}][id]", content.key %>
       <% (content.globalize_locales & enabled_locales.map(&:to_sym)).each do |locale| %>
         <%= render Admin::SiteCustomization::InformationTexts::FormFieldComponent.new(content, locale: locale) %>
       <% end %>

app/components/admin/site_customization/information_texts/form_field_component.html.erb

@@ -1,5 +1,4 @@
 <% globalize(locale) do %>
-  <%= hidden_field_tag "contents[content_#{i18n_content.key}][id]", i18n_content.key %>
   <%= text_area_tag "contents[content_#{i18n_content.key}]values[value_#{locale}]",
                     text,
                     rows: 5,