Translate 2016 04 07 react v15 (#355)

* started translating 2016-04-07-react-v15

* translated introduction and installation guide sections

* started to translate the changelog

* finish the translation of React v15.0

* adhere to the official translation glossary

* Remove extra "e" in content/blog/2016-04-07-react-v15.md

Co-Authored-By: Jussara Soares <[email protected]>

* Update content/blog/2016-04-07-react-v15.md to replace "mudanca" with "mudança"

Co-Authored-By: Jussara Soares <[email protected]>

* Update content/blog/2016-04-07-react-v15.md

Co-Authored-By: Jussara Soares <[email protected]>

Author: 2 people