Resolve "Some data missing in substitutions table view"

Closes #76 (closed)

aleksis/apps/chronos/templates/chronos/partials/subs/colour.html

@@ -6,4 +6,6 @@
   {% endif %}
 {% elif item.type == "supervision_substitution" %}
   blue-text
+{% elif item.type == "event" %}
+  purple-text
 {% endif %}