Added: During payment process, save the package currency in the DB (like the amount)
to show the right information about the payment even when admin user change the package price or currency.
Updated: Admin panel: Show the right error message when the backup fails.
Fixed: Bugfix: Fix the LC_MESSAGES error, when PHP wasn't compiled with libintl.
Fixed: Bugfix: Save the payment amount in the DB when PayPal is used as payment method.
Updated: Minor improvements & Code cleaning.
Updated: Composer update.