i18n: Format large integers before the translation message

i18n: Format large integers before the translation message

The GNU gettext only supports the ISO C99 macros for integral
types. If there is a need to use unsupported formatting macros,
e.g. PRIuGRUB_UINT64_T, according to [1] the number to a string
conversion should be separated from the code printing message
requiring the internationalization. So, the function grub_snprintf()
is used to print the numeric values to an intermediate buffer and
the internationalized message contains a string format directive.

[1] https://www.gnu.org/software/gettext/manual/html_node/Preparing-Strings.html#No-string-concatenation

Signed-off-by: Miguel Ángel Arruga Vivas <rosen644835@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>