* add username error label, add word wrapping for error labels
* make lint
* last commits
* remove font, and remove some lambdas
* add QRegularExpression for regex
* improve review things
* add isModified() for checkFields()
* add check isModified() for all fields in checkFields
* Update src/RegisterPage.cpp
Co-authored-by: DeepBlueV7.X <nicolas.werner@hotmail.de>
* remove emit call for showError
Co-authored-by: DeepBlueV7.X <nicolas.werner@hotmail.de>