[FIX] Link preview containing HTML encoded chars (#16512)

app/oembed/client/oembedUrlWidget.html

@@ -25,7 +25,7 @@
 						<a href="{{url}}" rel="noopener noreferrer" target="{{target}}"><strong>{{{title}}}</strong></a>
 					</div>
 				{{/if}}
-				<div style="overflow:hidden;white-space:nowrap;text-overflow:ellipsis">{{{description}}}</div>
+				<div style="overflow:hidden;white-space:nowrap;text-overflow:ellipsis">{{description}}</div>
 			</div>
 		</blockquote>
 	{{/if}}

app/oembed/client/oembedUrlWidget.js

@@ -1,6 +1,7 @@
 import { Blaze } from 'meteor/blaze';
 import { Template } from 'meteor/templating';
 import _ from 'underscore';
+import s from 'underscore.string';
 
 const getTitle = function(self) {
 	if (self.meta == null) {
@@ -17,14 +18,14 @@ const getDescription = function(self) {
 	if (description == null) {
 		return;
 	}
-	return _.unescape(description.replace(/(^[“\s]*)|([”\s]*$)/g, ''));
+	return s.unescapeHTML(description.replace(/(^[“\s]*)|([”\s]*$)/g, ''));
 };
 
 Template.oembedUrlWidget.helpers({
 	description() {
 		const description = getDescription(this);
 		if (_.isString(description)) {
-			return Blaze._escape(description);
+			return description;
 		}
 	},
 	title() {