Merge pull request #2 from nucliweb/master

Revisión ortográfica por @nucliweb
Updates README.md, english sentence translated
Fixes typo error (ul.na would be ul.nav)
Fix 404 link in grid system
Add Translations from original
Merge pull request #6 from perichus/master

Cambio en el enlace del sistema de Grids
Merge pull request #4 from borjacampina/patch-2

Fixes typo error (ul.na would be ul.nav)
Merge pull request #3 from borjacampina/patch-1

Updates README.md, english sentence translated
Update