Add option to enable the 'SMEI_SORT_DIRECTION' experiment

This option, when enabled, activates the SMEI_SORT_DIRECTION experiment,
which is disabled by default in the Community Console.

This experiment lets user set the sort direction in thread lists, so
threads can be ordered in ascending or descending order.

Fixes: #25
Change-Id: Ie8f6825e70d11ee7d3e20a38a7f20e2a34780d9f
diff --git a/src/_locales/es/messages.json b/src/_locales/es/messages.json
index a0e97bf..0e5b0a6 100644
--- a/src/_locales/es/messages.json
+++ b/src/_locales/es/messages.json
@@ -87,6 +87,10 @@
     "message": "Añade la opción para bloquear varios hilos en la lista de hilos de la Consola de la Comunidad.",
     "description": "Feature checkbox in the options page"
   },
+  "options_smei_sortdirection": {
+    "message": "Activa el experimento <code class=\"help\" title=\"Este experimento te permite ordenar la lista de hilos de la Consola de la Comunidad en orden ascendente o descendente.\">SMEI_SORT_DIRECTION</code>.",
+    "description": "Feature checkbox in the options page"
+  },
   "options_profileindicator_header": {
     "message": "Punto indicador",
     "description": "Heading for the profile indicator feature options"