Navigation: fix spacing as designed

The design team has noticed that the spacing in the navigation is not as designed for desktop sizes. The search field is too short and too far from the donate button, the language menu too far from the logo, the donate button is shorter than designed, the logo is incorrect.

The design is here: https://drive.google.com/drive/u/1/folders/0B9Iy5alL4K2HWm9kTVVqbXFKeEk