OO-2057 fix more nullpointers when no binder and sections is available, styling ep start page, entries listing, binder listing, adding de translations

OO-1867: upgrade selenium and arquillian libraries to support Firefox 46 and update the tests to work with them

OO-1976 add markup for better search result customization, add background to highlight search results

OO-1658 implement HelpTooltip componente to use the new form context help also outside of the form context

OO-991 i18n, xss, fix filename in download, add mail form for coach, improved status feedback, allow submission without documents, add missing identity to created files

OO-1435 allow fullscreen mode in iframes (IE11+, FF, Safari, Chrome), set max size of video player to 100% (a little bit responsive)

OO-1426 move styles that can be used in html editor to a separate scss file which is included in content and in the theme to render in iframe and in main window