Translate the alternate links for welsh action plan
Translate the alternate links for welsh action plan

* Without inherits from the Embed controller, the welsh link was broken.
* Since the action plans heavily uses the ActionPlan::Redundancy,
  this is necessary to mount_point method does not raise Name errors

moneyadviceservice/frontend,moneyadviceservice/frontend,moneyadviceservice/frontend,moneyadviceservice/frontend