This is the only website i have in my favourites that does Czech
Language Translation -- English, French, German, Spanish, Italian, Portuguese, Dutch, Russian, Greek, Norwegian, Chinese, Japanese & Korean
If it doesnt work, google Czech language translators, i use online translators alot at work but have never tried this one, if it returns complete garbage, keep looking or there are lots of pay sites
Forgot to mention, there are multiple translator programs on the page, only one has Czech, its around the middle of the list.