Show supporters on motion slide if available.

CHANGELOG

@@ -8,6 +8,9 @@ Version 1.6.1 (unreleased)
 ==========================
 [https://github.com/OpenSlides/OpenSlides/issues?milestone=16]
 
+Motions:
+- Show supporters on motion slide if available.
+
 Participants:
 - Fixed participant csv import for group id:
   * Allowed to add multiple groups in csv group id field, e.g. "3,4".

openslides/motion/templates/motion/slide.html

@@ -55,6 +55,17 @@
         -
     {% endfor %}
 
+    <!-- Supporters -->
+    {% with motion.supporter.all as supporters %}
+    {% if supporters|length > 0 %}
+        <h4>{% trans "Supporters" %}:</h4>
+        {% for supporter in supporters %}
+            {{ supporter.person }}{% if not forloop.last %},<br> {% endif %}
+        {% endfor %}
+        </p>
+    {% endif %}
+    {% endwith %}
+
     <!-- Category -->
     {% if motion.category %}
         <h4>{% trans "Category" %}:</h4>