Replaced generic with an even more generic

templates/modals/confirm-leave-organisation.html.twig

@@ -7,7 +7,7 @@
     {% include "forms/csrf.html.twig" %}
     <div class="js-form-alerts">
     </div>
-    <h4>{{translate("ORGANISATION.LEAVE_CONFIRM", {name: organisation.name})}}<br><small>{{translate("LEAVE_CANNOT_UNDONE")}}</small></h4>
+    <h4>{{translate("ORGANISATION.LEAVE_CONFIRM", {name: organisation.name})}}<br><small>{{translate("ACTION_CANNOT_UNDONE")}}</small></h4>
     <br>
     <div class="btn-group-action">
         <button type="submit" class="btn btn-danger btn-lg btn-block">{{translate("ORGANISATION.LEAVE_YES")}}</button>