Customize theme for Nicaragua.

Define some colours, larger font size on menu, with underline on hover, same text colour on submenu, show focused inputs, no background by default in inputs. Don't make greeting text use background colour.
Add a margin between search box and button
Make the menu coloured on smaller devices so it is obviously a menu.
Remove example code.
Generate locale translation strings

Command used: bundle exec rake gettext:find_theme
Adjust size for Spanish text.
fixup! Generate locale translation strings
Add appropriate license

This theme is derived from http://tuderechoasaber.es, so needs an CC-SA
compatible license.
Add footer template.
Add footer translations.
Add some placeholder logos.
Add footer links
Remove footer layout

Handling this in _footer_layout.scss
Set incoming and outgoing correspondence colours.
fixup! Remove footer layout
WIP about.