Comment 2 for bug 692799

Applied the patch, and made a few other changes. There is also an "Advanced Edit" menu on the main form which I applied the same basic code to. And... the error messages were not being correctly translated, so I fixed that as well. subprocess.Popen() is asynchronous, so I added another call to make OpenShot wait for Inkscape to finish, so we can update the thumbnail and preview window correctly, etc...