Fix Typos - 01

Refs:
https://github.com/jryannel/qt5-cadaques/issues/213
https://github.com/jryannel/qt5-cadaques/issues/206
https://github.com/jryannel/qt5-cadaques/issues/111
https://github.com/jryannel/qt5-cadaques/issues/115