Stephen,

>1. He want to be able to switch back to the default language with a hotkey at runtime.

Yes, will definitely be able to change the language dynamically at run time.

>2. There will be localized label AND custom label. This mean on top of the localized version of the label, the customer can also change the text of any label to whatever they like.

I'm not sure how the custom label is different than the localized label, since the end user CAN change the text of the label to whatever they want.

Regards,