Emulator updates.
Fixes #761 - Some images were missing in the staging server because we didn't default to english
#762 - First in another round of fixes for localization
#762 fixing staging and some other issues
Fixes #742 - adds hreflang to all pages when there are translations available.  Fixes #762 no longer showing multiple translations on home pages. Fixes #764 ensures that if an article is known to be translated in the language of the page it will link to it with the ?hl=langcode scheme
Ensuring the homepage links to the localized getting started guide
Merge pull request #763 from umaar/devtools-emulation-updates

Emulator updates.
Translate index.html under `fundamentals` folder into Chinese
Various fixes.
Update the dates for articles.
Merge pull request #766 from umaar/various-fixes

Various fixes.
Merge pull request #765 from chenxsan/master

Translate index.html under `fundamentals` folder into Chinese
Making config single site

This one needs to be single site so make server works - @paulkinlan is
this one needed for the appengine build? It would be much better to have
that served off a different config if so so that simple jekyll builds
work OK!
add missing quote
Merge pull request #769 from chenxsan/master

add missing quote