Rename "Credit card number*" to "Credit card" to fix scan cc on mobile
Rename "Credit card number*" to "Credit card" to fix scan cc on mobile

Problem:

On mobile safari the registration form was asking the user to scan their
credit card for _all_ form elements and was placing the credit card
number on the first billing info line for reasons unknown to human kind.

Solution:

Rename "Credit card number*" to "Credit card". This is more consistent
with our BN/MO flows as well.

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