Added thread number to the reply form title.

boards/templates/boards/thread.html

@@ -64,7 +64,7 b''
     <form id="form" enctype="multipart/form-data" method="post"
             >{% csrf_token %}
         <div class="post-form-w">
-            <div class="form-title">{% trans "Reply to thread" %}</div>
+	    <div class="form-title">{% trans "Reply to thread" %} #{{ posts.0.id }}</div>
             <div class="post-form">
                 <div class="form-row">
                     <div class="form-label">{% trans 'Title' %}</div>