I know the word lists aren't complete. This was the best I could do given the time constraint, the fact that I don't actually speak 19 languages... And also, after two evenings of googling dirty words, I started feeling like I'm about to acquire Tourette's in some unknown language ;)
I'll update the database with the words submitted here and through the form on the site. Thanks!
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Edit -- here's Google Analytics for this site after 1 hour on the HN frontpage:
http://wordsafety.com/img/analytics_2015-08-25_1736.jpg
This is a site that had essentially zero traffic before HN, so I figured this would be a potentially interesting glimpse into HN's audience.