Add locale links to header

Closes #24
Fix static pages spec
Add a stylesheet file, a "Get Started" string and change the index page

So I've added basic styling. This is by far not done, but already looks
a lot better. For lack of decision, I used Source Sans Pro (which I kinda like
as a font). It's all black on white for the moment.

The footer still has a bug, as it's always on the bottom of the viewport. Ah
well, CSS.
Modify locales files
Add controllers actions
Merge branch 'master' of github.com:BatchZero/webcal into 4-events_views
Modify / Add  locales
Merge branch '4-events_views' of github.com:BatchZero/webcal into 4-events_views