Fix Language Editor not appearing when menu item clicked
Replace all common dialog owner references with getModalOwner().hWnd

Should fix the problem of common dialogs not appearing atop child
windows in float mode.
Fix top-most window behavior when common dialogs are displayed

When toolboxes are in floating mode, they will no longer appear over the
top of common dialogs.  Instead, their top-most status will be removed,
the common dialog will be displayed, then top-most status will be
restored afterwards.