Correct the delete warning message title and interrogative sentence

When deleting files from qfiledialog a message box with "Save" title is displayed with the following text : "Are sure you want to delete '<file name>'?"

In qfiledialog cpp source file (http://qt.gitorious.org/qt/qt/blobs/4.7/src/gui/dialogs/qfiledialog.cpp) I have found this:

QFileDialog::tr("Are sure you want to delete '%1'?")

The interrogative sentence is incorrect, it should be:

"Are you sure you want to delete '%1'?"

and the title of message box should be "Delete".