Allow html code in speaker field of preview macro (#147)

templates/macros.html

@@ -8,7 +8,7 @@
 				<span>{% if ismod() %}ID: {{lecture.id}}{% endif %}</span><br>
 				<span>{{ lecture['time'] }}</span>
 				{% if lecture['speaker'] %}
-					<div class="small">Gehalten von {{ lecture['speaker'] }} </div>
+					<div class="small">Gehalten von {{ lecture['speaker']|safe }} </div>
 				{% endif %}
 			</div>
 			<div class="col-xs-4">