* removed hardcoded strings from CanvasEditorWindow.xaml
* removed hardcoded strings from GridEditorWindow.xaml
* loc
* Localized MainWindow
* reverting MainWindow.xaml as it is not rendering the window as expected
* Changed the resource settings from internal to public
* the culture is set based on the culture of the system UI set in the system settings
* Removed the french resource files used for testing
* Localized canvasWindow and mainwindow
* Removed setting the UI culture explicitly as it would be implicitly set to the culture of system UI
* Removed redundant header file
don't exit when clicking on "Apply" if no layout is selected
Credit to @AlexR3 for the fix. Alex provided a more extensive fix that disable the button when no layout is selected, but it requires more changes to the XAML and we preferred to avoid that now.
