https://github.com/NodeBB/NodeBB/issues/8637 show displayname

templates/partials/topic/post.tpl

@@ -8,7 +8,7 @@
 
 	<small class="pull-left">
 		<strong>
-			<a href="<!-- IF posts.user.userslug -->{config.relative_path}/user/{posts.user.userslug}<!-- ELSE -->#<!-- ENDIF posts.user.userslug -->" itemprop="author" data-username="{posts.user.username}" data-uid="{posts.user.uid}">{posts.user.username}</a>
+			<a href="<!-- IF posts.user.userslug -->{config.relative_path}/user/{posts.user.userslug}<!-- ELSE -->#<!-- ENDIF posts.user.userslug -->" itemprop="author" data-username="{posts.user.username}" data-uid="{posts.user.uid}">{posts.user.displayname}</a>
 		</strong>
 
 		<!-- IMPORT partials/topic/badge.tpl -->