Windsock image optimization

Make it transparent just in case. And also bigger!
Localization refactoring

Support arbitrary number of languages (but mostly a more correct
approach)
Layout fix: right panel width in ems

This gives the layout some flexibility in case of font size changes.
For example, now zooming works.
Remove unneeded styling.

It was not in effect anyway because of not specifying the units for "5".
Slight layout fix

jQuery-UI issue workaround: menu sometimes appears to wide and leads to
a horizontal scroll on the whole page. Ughhhh, ugly!
Reach sets documentation, improve the legend.

Fix #18