Create event theme admin entity

src/Bundle/ChillEventBundle/Resources/views/Entity/event_theme.html.twig

@@ -0,0 +1,13 @@
+{% set reversed_parents = parents|reverse %}
+<span class="chill-entity entity-event-theme">
+  <span class="badge bg-chill-l-gray text-dark">
+    {%- for p in reversed_parents %}
+        <span class="parent-{{ loop.revindex0 }}">
+      {{ p.name|localize_translatable_string }}{{ options['default.separator'] }}
+    </span>
+    {%- endfor -%}
+    <span class="child">
+      {{ eventTheme.name|localize_translatable_string }}
+    </span>
+  </span>
+</span>