`norvigs-lispy`: translate "Uma calculadora" to PT

[ramalho]

Document to translate:

https://github.com/fluentpython/lispy/blob/main/workshops/pythonbrasil2021/norvigs-lispy.ipynb

To look up or propose a standard PT-BR translation to a specific term, please read and submit improvements to GLOSSÁRIO.md.

[rafavillalta]

Estou fazendo!