several little design improvements

add a little text-shadow and desaturate green and red colors a bit in the top menu so that colors look more serious
adjust the size of each icons so that they fit on the same line in the top menu
replace two icons that were too abstract with an improved version
update the language bar icon for one that is less blurry
use gradients and borders in menus to break the cartoonish 2D effect
hover on menu now use a nice grey, previous hover was an extreme contrast
add a color underline for the top menu to make it looks less floating in space
use a light shadow to increase the perspective with the background
add a little margin between the top menu and the text