Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/image/templates/image-rotate-summary.html.twig

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+{#
+/**
+ * @file
+ * Default theme implementation for a summary of an image rotate effect.
+ *
+ * Available variables:
+ * - data: The current configuration for this resize effect, including:
+ *   - degrees: Degrees to rotate the image, positive values will rotate the
+ *     image clockwise, negative values counter-clockwise.
+ *   - bgcolor: The hex background color of the new areas created as consequence
+ *     of rotation.
+ *   - random: If the rotation angle is randomized.
+ * - effect: The effect information, including:
+ *   - id: The effect identifier.
+ *   - label: The effect name.
+ *   - description: The effect description.
+ *
+ * @ingroup themeable
+ */
+#}
+{% if data.random %}
+  {% trans %}
+    random between -{{ data.degrees|abs }}° and {{ data.degrees|abs }}°
+  {% endtrans %}
+{% else %}
+  {{ data.degrees }}°
+{% endif %}