bsdinstall patch [3/3] variable reuse

[Allan Jude]

dteske@ reused the variable 'disks' in zfsboot

it starts off being used to track the grammar for the number of disks
(singular vs plural)

and then it is reused as the list of available disks

replace the variable with disks_grammar and move 'disk' and 'disks' to
msg_ vars so they can be translated in the future.
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