Merge pull request django-cms#4686 from divio/typo

Typo

Author: yakky

cms/templates/cms/toolbar/dragitem.html

@@ -19,7 +19,7 @@
             </div>
         {% else %}
             <div class="cms-hover-tooltip cms-hover-tooltip-left cms-plugin-disabled" tabindex="-1"
-                data-tooltip="{% trans "This plugin cannot be moved or edited outside of it's parent" %}">
+                data-tooltip="{% trans "This plugin cannot be moved or edited outside of its parent" %}">
                 <span class="cms-icon cms-icon-lock"></span>
             </div>
         {% endif %}