Existing in a variety of forms, the quatrain appears in poems from the poetic traditions of various ancient civilizations including Ancient India, Ancient Greece, Ancient Rome, and China; and, continues into the 21st century, where it is seen in works published in many languages.
I always thought that Mgr. refers to a manager and that's what you find in dictionaries as well. People in Czech use it to stress the fact they are the boss:) Magistr does apply to Master, as in Master's degree, and short versions are M, MAS, or mstr.
In other words, what language do people in Czech Republic speak? The language that people speak in Czech Republic is Czech. Okay, now that you know what people from Czech Republic are called and you know what language they speak, you may want to learn more about the people of Czech Republic.