Profanity is an issue and would be great to get rid of it. I had the same problem when composing the database for English, large fraction of the time was spent on that. I would suggest to filter the database and remove all n-grams that include any of the words that are classified as "bad". For that, we need a list of the words (possibly as substrings). That would have to be provided by native speakers though. Maybe such list is composed already somewhere...