* UPDATE: Improved InSite with authenticators.
* UPDATE: Added more non-english caracters to sanitization.
* UPDATE: Now if the customer language is not in plugin array, the plugin use English language.
* UPDATE: Improved redirection with modal. Now the modal is closed when the customer press cancel bitton in Redsys.
* FIX: Fixed an error when Pay with 1click is not active in InSite.
* FIX: Fixed many Notices and some Warnings.
FIX: Fixed an error with Pay button from My account when WooCommerce Subscriptions is not installed.
FIX: Fixed a function that in some servers can cause a fatal error.
* Fixed Typo in Global function get_last_four()
* Fixed pay with 1click in redirection.
* IMPROVED: Improved compatibility with the generated payment link by WooCommerce (Redsys redirection).
* FIXED: Fixed an error with Redsys in the Checkout (InSite). Using $this when not in object context.