[D-I] New strings to translate in debconf

[Christian Perrier <bubulle@debian.org>]

Dear translators,

Please bless Denis Barbier who is careful about giving us some work...:-)

debconf (1.4.48) UNRELEASED; urgency=low

  * Apply patch from Denis Barbier to translate --help output. See #167177

(kidding, Denis, this is of course a good enhancement)

This should soon appear on Dennis (not the same) Stampfer d-i status
pages, in "level 4" translations.

Just in case, I'll use podebconf-update-po anyway, to warn all
translators about the change.

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