YITH WooCommerce Customize My Account Page 4.14.0

* Fix: endpoint link not saved correctly when assigned to a group

New Option to add additional classes to menu item.
Update Plugin Core.
Update Language files.
Update Deprecated endpoints slug.
Fix Notice for missing endpoint slug.
Fix Remove deprecated endpoint "saved-cards" for YITH WooCommerce Stripe.
Dev Refactoring of plugin's options and admin templates.

* Fix: WPML label and url translation for link.