Update README.md
add a link for each language
restore the file name of each book
Update free-programming-books-ch.md
Merge pull request #311 from maieul/master

2 mooc de l'EPFL : Java et C++
Add resource for styling Android Applications
Update free-programming-books-ch.md
Merge pull request #312 from xamroc/android-styling

Add resource for styling Android Applications
Merge pull request #313 from ictxiangxin/master

translate some english words to chinese
Add the portuguese version of the book byte of python
Merge pull request #314 from ataliba/ataliba

Add the portuguese version of the book byte of python