Catches a couple translations, hides profile box when empty

bookwyrm/templates/snippets/username.html

@@ -4,7 +4,7 @@
 <{% if anchor %}a href="{{ user.local_path }}"{% else %}span{% endif %}
     class="user ml-1"
 >
-    {{ user.name|default:user|username }}
+    {{ user.display_name }}
 </a>
 
 {% if possessive %}'s{% endif %}
@@ -12,4 +12,4 @@
 {% if show_full and user.name or show_full and user.localname %}
  ({{ user.username }})
 {% endif %}
-{% endspaceless %}
+{% endspaceless %}