Although you don’t state what the exact problem is, you are using the wrong function: appendTo tries to append $('#block-message') to the Zpráva neodeslána element (which does not exist).
You need something like the append(), text() or html() functions instead.
For example:
$('#block-message').text('Zpráva odeslána').addClass('good').slideUp();
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solved jquery ajax dont works – succes and error [closed]