Fix
create app functional "Default settings"
create 2 functions: loadAppLang and saveAppLang and methods setAppLang ang getAppLang - class pSettings. Functions  - public, methods - public. For use - include settings.h
Merge pull request #51 from ITAAcademy/AndriiN/Settings

Andrii n/settings
Merge branch 'FixForMErge' into ivan/List_opened_windows

Conflicts:
	mainwindow.cpp
	mainwindow.h
	mainwindow.ui