Since Pavel doesn't speak any English, I too would assume this is someone else you're dealing with.
In all my encounters I find that when dealing with someone who speaks no English, they send something in fairly clear English, you're dealing with a friend or manager who has very low morals. Nuns don't translate for rentboys.
I'm going through the same thing with Patryk in Prague and with a blond Argentine living in Fort Lauderdale now. Both want to come visit here and that is a nightmare of communication ! English vocabulary of maybe 30 words tops. And when I am surprised with a clear English paragraph, it's clearly from someone else who's a not-nice hustler type. The Argentine (Nico) is hopefully coming Wednesday for a week but it's taken 2 trips to FLL for me and 3 months of erratic communications. (He is worth it!)
The language thing is amazingly difficult. Almost impossible. And Google Translate is not your friend in Czech. (It may be almost decent in Spanish).
All you should be concerned with is date, time, amount (after!) at first. After you know someone it gets a little easier.