added variable to replying to string

public/language/en_GB/topic.json

@@ -94,7 +94,7 @@
 	"composer.help": "Help",
 	"composer.discard": "Discard",
 	"composer.submit": "Submit",
-	"composer.replying_to": "Replying to",
+	"composer.replying_to": "Replying to %1",
 	"composer.new_topic": "New Topic",
 
 	"composer.uploading": "uploading...",

public/src/modules/composer.js

@@ -627,7 +627,7 @@ define(['taskbar'], function(taskbar) {
 					};
 
 				if (parseInt(postData.tid, 10) > 0) {
-					translator.translate('[[topic:composer.replying_to]]: ' + postData.title, function(newTitle) {
+					translator.translate('[[topic:composer.replying_to, ' + postData.title + ']]', function(newTitle) {
 						titleEl.val(newTitle);
 					});
 					titleEl.prop('disabled', true);