Merge pull request #83 from luhcas/master

Optische Anpassungen des Tooltips und Navigation
show corrections only for self tests, fixes #79
fix how new chapters are created when the user changed its title in the form, fixes #89
remove unused switchToView function
add new navigateTo function
transfer section model via HTML
import i18n
lets delete sections!
remove the loading class after the document's location has been changed, especially important if the old URL and the current URL do not differ, fixes #84
add CSS changes to LESS after 2aa7aef
ignore LESS files whose filename starts with a "_"
move toolbar.less to _toolbar.less
fixes #66
fix #121
white space fixes
define 'visited' fields for sections
use section's title in link to it
use sections' fields when displaying them, fixes #70
style visited sections prematurely, refs #70
prepare section icons, refs #73