Setup welcome page & localization support

Few lines of ruby code, mostly env setup.
I'm afraid I won't have time to do that as I'm still a full-time student and part-time tutor. 

Refining CSS is not only about the css files itself. The template files and page structuring matter as well. You'll get better at CSS the more you fiddle with it. As a guideline, take a look at https://github.com/styleguide/css and follow the good practices there. 

I'm learning rails at the moment so I hope I'll be able to contribute to the new Coursemology in the near future too.