Proper errors, loading indicators and more animations

res/css/_animations.sass

res/css/_content.sass

res/css/_loading.sass

res/css/_nav.sass

res/css/search.css

res/css/search.sass

res/js/component/app.js

res/js/component/app.jsx

res/js/component/error.js

res/js/component/error.jsx

res/js/component/loading.js

res/js/component/loading.jsx

res/js/component/nav.js

res/js/component/nav.jsx

templates/search.phtml

translations/de.json

translations/en.json