Add 'Edit this release' button to release pages

Author: hugovk

templates/downloads/release_detail.html

@@ -21,6 +21,9 @@
 
 {% block content %}
     <article class="text">
+        {% if request.user.is_staff %}
+        <a role="button" class="button" href="{% url 'admin:downloads_release_change' release.pk %}">Edit this release</a>
+        {% endif %}
 
         <header class="article-header">
             <h1 class="page-title">{{ release.name }}</h1>