Truncate post texts by words preserving html tags, not just by chars.

templates/posting_general.html

@@ -34,7 +34,7 b''
                         >{% trans "Reply" %}</a>]
                 </div>
                 {% autoescape off %}
-                    {{ thread.text.rendered|truncatechars:300 }}
+                    {{ thread.text.rendered|truncatewords_html:50 }}
                 {% endautoescape %}
             </div>
             <div class="metadata">
@@ -75,7 +75,7 b''
                                     [{{ post.pub_time }}]
                                 </div>
                                 {% autoescape off %}
-                                    {{ post.text.rendered|truncatechars:300 }}
+                                    {{ post.text.rendered|truncatewords_html:50 }}
                                 {% endautoescape %}
                         </div>
                         </div>