Add content to the Remote Census Configuration tab

- Render remote census configuration content on settings index.
 - Update type method from Setting
   On Admin::SettingsController#index we are using 'all_settings' to
   group all settings by 'type' method.
   'type' method return the first part of key when split by '.'
   To allow use by example: all_settings["remote_census.general"]
   and recover only settings related with this key we have added new
   'elsif' on 'type' method.

app/views/admin/settings/_remote_census_configuration_tab.html.erb

@@ -0,0 +1,5 @@
+  <h2><%= t("admin.settings.index.remote_census.title") %></h2>
+
+  <%= render "settings_table", settings: @remote_census_general_settings %>
+  <%= render "settings_table", settings: @remote_census_request_settings %>
+  <%= render "settings_table", settings: @remote_census_response_settings %>

app/views/admin/settings/index.html.erb

@@ -25,4 +25,8 @@
   <div class="tabs-panel" id="tab-proposals">
     <%= render "proposals_dashboard" %>
   </div>
+
+  <div class="tabs-panel" id="tab-remote-census-configuration">
+    <%= render "remote_census_configuration_tab" %>
+  </div>
 </div>