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

@@ -130,12 +130,14 @@ define('forum/topic/events', [
 		};
 
 		templates.parse('partials/topic/post-editor', editData, function(html) {
+			require(['translator'], function(translator) {
 				translator.translate(html, function(translated) {
 					html = $(translated);
 					editorEl.replaceWith(html);
 					html.find('.timeago').timeago();
 				});
 			});
+		});
 
 		if (data.topic.tags && tagsUpdated(data.topic.tags)) {
 			templates.parse('partials/post_bar', 'tags', {tags: data.topic.tags}, function(html) {