Kudos to the author of the article for his perseverance in decorating message to fit grammar. I'd go another way, just using more formal and dry format:
Number of scanned directories: %g
Number of found files: %g
That solves the problem with Slavic languages at least. Italian aversion to 0 may be mitigated with printing 'none', I guess. Please correct me if this form does not fit other languages.
Just scanned the comments to see if anyone would suggest that :) Being the lazy type, that's the first thought I had reading the article. Perhaps it's not appropriate for all target audiences and all target languages but many times you can find a much easier solution by going about it in a totally different way.
