Fix problem with Chinese text in scene.title, caption.title, and label.text (use appendcmd)
Fix problem with Chinese text in scene.title, caption.title, and label.text (use appendcmd)

BruceSherwood/vpython-jupyter,BruceSherwood/vpython-jupyter,mwcraig/vpython-jupyter,mwcraig/vpython-jupyter,mwcraig/vpython-jupyter,BruceSherwood/vpython-jupyter,mwcraig/vpython-jupyter,BruceSherwood/vpython-jupyter