update Simplified Chinese translations
Merge pull request #351 from muzuiget/master

Update Simplified Chinese translations
Fixed Python 3.3 compatibility when submitting inline model
Merge pull request #352 from petrus-jvrensburg/docs

More updates to Docs.
Merge branch 'master' into docs
Updates to 'Database backends' page.
Updates to 'Form rules' page.
Add link between 'Database backends' and the guide for creating them.