Google has their Speech to Text servers block out inappropriate words by default. This isn't to censor you though.
According to Google, they did this because their speech recognition software is still a beta release and it's translation capabilities are far from perfect. They wanted to prevent the software from mishearing a common word and translating it to something the owner would find offensive, especially if that owner was a minor.
Menno, I see what you're saying, thanks. This may be 3 years late, but there problem is still here and it IS a problem. How hard would it be to install a language filter option? In this way parents could choose to censor their children or themselves. Google is absolutely forcing censorship and making their product less efficient in the process. In my opinion, it could be seen as a violation of the U.S.'s constitutional right to free speech. Fortunately for google, the constitution doesn't hold any weight any more, and hey, it's their phone. However, I paid about $400 for my evo, and I'm having censorship forced on me. That's not really fair. This is a problem of priciple which is way worse than a technical fault. I do enjoy my evo, but I'll be swapping to an Iphone as soon as contract is up if there's no change to this. Also, I'll be posting in threads here and there, and seeing to it that my friend are made aware of it. Not because I necessarily want to curse like a sailor, but because I want the FREEDOM to do so if I please.
P.S. fresh ground dunkin doughnut beans with filtered water ;-)