Merge branch 'master' of https://github.com/sagemath/website
Merge branch 'master' of https://github.com/sagemath/website
Merge branch 'master' of https://github.com/sagemath/website
Merge branch 'master' of https://github.com/sagemath/website
Merge branch 'master' of https://github.com/sagemath/website
fixing pdf symlink (some languages are broken, though)