Using dict format to allow standard lang codes

Allowing standard language code makes easier to backends to send it to
converse.js keeping coherence.

index.html

@@ -171,7 +171,7 @@
             auto_subscribe: false,
             bosh_service_url: 'https://bind.opkode.im', // Please use this connection manager only for testing purposes
             hide_muc_server: false,
-            i18n: locales.en, // Refer to ./locale/locales.js to see which locales are supported
+            i18n: locales['en'], // Refer to ./locale/locales.js to see which locales are supported
             prebind: false,
             show_controlbox_by_default: true,
             xhr_user_search: false

locale/locales.js

@@ -29,13 +29,14 @@
         "it",
         'ptbr'
         ], function (jed, af, en, es, de, hu, it, ptbr) {
-            root.locales = {};
-            root.locales.af = af;
-            root.locales.en = en;
-            root.locales.es = es;
-            root.locales.de = de;
-            root.locales.hu = hu;
-            root.locales.it = it;
-            root.locales.ptbr = ptbr;
+            root.locales = {
+                 'af': af,
+                 'en': en,
+                 'es': es,
+                 'de': de,
+                 'hu': hu,
+                 'it': it,
+                 'pt-br': ptbr
+            };
         });
 })(this);