Update events.js

Same problem as [#4069](https://github.com/NodeBB/NodeBB/pull/4069).  Added a **translator** variable refering to **translator** module instead of global *translator*.
This solves warnings editing posts with *composer*.

public/src/client/topic/events.js

@@ -130,10 +130,12 @@ define('forum/topic/events', [
 		};
 
 		templates.parse('partials/topic/post-editor', editData, function(html) {
-			translator.translate(html, function(translated) {
+			require(['translator'], function(translator) {
-				html = $(translated);
+				translator.translate(html, function(translated) {
-				editorEl.replaceWith(html);
+					html = $(translated);
-				html.find('.timeago').timeago();
+					editorEl.replaceWith(html);
+					html.find('.timeago').timeago();
+				});
 			});
 		});