add random templatetag

core/templatetags/core.py

-import os
 import html
 import json
+import os
+import random
 
 import bleach as python_bleach
 
@@ -42,6 +43,14 @@ def get(d, *args):
     return d
 
 
+@register.simple_tag(name='random')
+def random_item(_list):
+    try:
+        return random.choice(_list)
+    except IndexError:
+        return None
+
+
 @register.filter
 def filename(value, include_ext=True):
     base = os.path.basename(getattr(value, 'name', value))