<p>I don't think it really matters, but I would go with single space in anything I want "formal".  I usually put two spaces (like I just did writing this comment, actually), just out of habit, likely in an attempt to make sentences easier to discriminate in a fixed-width font email world, but that's about it.  Also, we apparently have only one double space in a translatable sentence, so let's stick with single ones.</p>

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