Remove description for screen readers

It was being duplicated when restoring a page by using browser
history. With this solution we will avoid to have screen readers
descriptions more than once inside any sociual share button.

app/assets/javascripts/application.js

@@ -173,6 +173,7 @@ var destroy_non_idempotent_modules = function() {
   App.Datepicker.destroy();
   App.HTMLEditor.destroy();
   App.LegislationAnnotatable.destroy();
+  App.SocialShare.destroy();
 };
 
 $(document).on("turbolinks:load", initialize_modules);

app/assets/javascripts/social_share.js

@@ -5,6 +5,9 @@
       $(".social-share-button a").each(function() {
         $(this).append("<span class='show-for-sr'>" + ($(this).data("site")) + "</span>");
       });
+    },
+    destroy: function() {
+      $(".social-share-button a .show-for-sr").remove();
     }
   };
 }).call(this);