Initial TranslateBehavior docs
Expanding on the attaching topic and creating sections for the rest of
the chapter
Fix markup for class/namespace.
Fix formatting.
Add a few more sections to the translate docs.
Basic grammar updates to translate behavior
Adding some adverbs
Fixing and expanding on some Translate examples
Finishing docs for TranslateBehavior
Merge pull request #1148 from cakephp/3.0-translate-behavior

3.0 translate behavior