[FIX] payment_stripe: avoid crash on non-ascii cardholder names

`str.format()` is only safe with byte-strings arguments, not unicode.
Unicode parameters would be automatically encoded using 'ascii'
encoding, resulting in a UnicideEncoreError in case any non-ascii
characters are present, which is quite likely.

Using '%' formatting on a str format string works the other way around,
and will cause the format string to be decoded into unicode if any
unicode params are present. This is typically safer because we never
use non-ascii characters in our format strings.

It also feels more natural than having to coerce the format string to
unicode using a u'' prefix.

This issue does not occur in Python 3, where either syntax will work.

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