multi lang support

[lsmith77]

likely related to #83

when dealing with a multi lingual site that allows inline translation and potentially falling back to content from a different language we need the following things:

• showing the language of the content being edited along with a selector to choose to persist any changes as a different language (note that a single page can contain content of varying languages)
• create must be able to pass the selected language along with the rest of the content in some semantic way to the server on persist
• content at the same path should be able to in different languages. ie if I have content at /home then f.e. when I make changes to the english version, I should not get those changes offered for restore when I am editing the german version

I guess points 2 and 3 could just be handled by encoding the language into the identifier/path.