Vietnamese translations update from Trần Ngọc Quân.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76225 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Prevent dialog widget from being destroyed during ShowModal()


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76226 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
use wxDialog::ShowModal() rather than gtk_dialog_run()
so all the things wxDialog::ShowModal() does are not bypassed


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76227 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775