fix(translation): german typos
feat(end): reset arrows

It is now possible to reset arrows which are hidden or which the user
can’t set.
update(FontAwesome): new version

- Update FontAwesome from 4.0.1 to 4.0.3
- Change `fa-reorder` to new `fa-bars`
change(CSS): more clarity
new(Gruntfile.js): grunt task `changeVersion`

- new grunt task which can change the version
change(package.json): update dependencies
change(README): section about changing version