GiftCardType: customer field doesnt use token for label

[seizan8]

Setono\SyliusGiftCardPlugin\Form\Type\GiftCardType

The customer field doesn't have a label parameter and so simply uses "customer" instead of a translation token.
"sylius.ui.customer" should probably used as label here, similar to the amount field.

[Roshyo]

Thanks for reporting this issue @seizan8 ! it is now fixed on 0.12 branch.

[seizan8]

neat. thanks :)