Let's take a few words at random:
 
SLUT: 1. Well known expletive in English.
      2. "End" in Swedish
 
PITT: 1. Well known expletive in Swedish.
      2. Surname of well known American actor.
 
FAN:  1. Air Motion Device in English.
      2. Well known expletive in Swedish.  Probably the most used and the
         first you'd want to censor - we'll just ask the Americans to say
         "AMD" instead, I'm confident they will oblige gracefully :-)
 
I could  go on forever, and  that's with just two  languages. Besides, if
you censor the well known words, people will just misspell them to bypass
the filters. I'm afraid what you need is a moderated list.
 
  Eric