This application is discontinued. This means that there is no support and there is no way to find out if English to Czech is available. However, there is an alternative you can use. It's called Clownfish for Skype. The application supports multiple languages and English and Czech is included. This means that the translation is possible.
Chat and make audio/video calls with your friends.
This is designed to help users to translate your Skype chats.
Spell check and translate your Skype messages to other languages.