am b91916b4: docs only. change the SDK tab to point to the release notes in offline mode; hide all other languages by default instead of depending on the stylesheet

Merge commit 'b91916b414b3c4ef3ec68bec9e84694d03a15331' into eclair-plus-aosp

* commit 'b91916b414b3c4ef3ec68bec9e84694d03a15331':
  docs only.