Translation of contratiempo

The script I am writing will shuffle the 1.5 million words and it will detect if too many words are from the same user. And if an entry is too long, I will skip it and rely on the sentences that we can hopefully make up together.
Take your time to answer me, do the vocabulary exercises and measure your progress! Your answers will be kept in the system itself. After that you can look at the statistics. That's pretty cool here.
What are you studying? Maybe we can write emails to each other in English or German. Thank you for your e-mail which I have received on Vocabulix just now. Write me if I can help you in learning German.