Hi!

#: mainqtwidget.cpp:180
#: mainqtwidget.cpp:190
#: mainqtwidget.cpp:200
Set if the fractions will appear in mixed form or not in the ...

I think it will be hard for users to understand these phrases. Maybe it is  
worth to remove "or not" and replace "will" with "have to"?

#: mainqtwidget.cpp:250
Check to force the will do in the reduced form.

Hard to understand. Can it be "Check to force the reduced form."?

Thanks in advance.