Updated spanish translation for tutorials-and-examples/blog/blog.rst
Update auth.rst

index.ctp view doesn't exists.
Merge pull request #1 from aleixfabra/patch-1

Update auth.rst
Fixed headers length
Model chapter (tutorial blog)
Adding migration notes for I18n
Adding migration notes for message formatting in I18n
Adding migration notes for the number library
Comments and feedback for i18n migration guide.
Merge remote-tracking branch 'docs/3.0' into 3-0-spanish-translations-blog
Some minor improvements
Revised blog.rst
Controller's part done
Blog Views
Blog - Adding articles
Update docs for Shell folder location.
migration note
Fix typo
Correct wording
General rewording/relinking 

Documentation right now really differs from English to Spanish. I'll try to update as much as I can.