picking "replied to" data from RT content

(fixing second part of #159)

js/twister_formatpost.js

@@ -69,6 +69,11 @@ function postToElem( post, kind ) {
         postData.attr('data-replied-to-screen-name', userpost["reply"]["n"]);
         postData.attr('data-replied-to-id', userpost["reply"]["k"]);
 
+        postData.find('.post-expand').text(polyglot.t("Show conversation"));
+    } else if ( "rt" in userpost && "reply" in userpost["rt"] ) {
+        postData.attr('data-replied-to-screen-name', userpost["rt"]["reply"]["n"]);
+        postData.attr('data-replied-to-id', userpost["rt"]["reply"]["k"]);
+
         postData.find('.post-expand').text(polyglot.t("Show conversation"));
     }