Code review comment for lp://staging/~dholbach/help-app/1425025-partial

Looks good to me as a starting point.

I'm thinking that for the web theme we won't be using this file, as the server should pick up the index.$LANG.html file directly.

However, for the phone theme, we'll need this, and it'll need some JavaScript code to:
- Read the value from the global window.navigator.language JS object
- Load the appropriate index.$LANG.html page according to the window.navigator.language value