That bug report, which I went on because it appeared on my "old l10n bugs" radar, contains a translation of debconf templates for...twiki..:-)
I suspect a mistake by the translator, which was not spotted by the maintainer. It is pretty likely that the original translator can't find the original translation, unless the Spanish l10n mailing list still has it somewhere. The bug was reported on Jan 5th, 2008, so searching in debian-l10n-spanish should be done just before that date. (No, I can't do that myself as I'm offline right now...) --
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