new css & js with first customization
further style improvements
navbar scroll effect
background image
language select
improved langaiuage sselect
list styling
profile styling
forms and translations
improved index pages
applications only for staff again
Merge branch 'develop' into new-style

Conflicts:
	app/views/job_offers/show.html.erb
settings page style
Merge branch 'develop' into new-style
removed checkbox shadow
improved edit pages
employer list style fix
Merge branch 'develop' into new-style

Conflicts:
	app/views/employers/_form_fields.html.erb
	app/views/employers/show.html.erb
	app/views/job_offers/archive.html.erb
small style issues
Merge pull request #447 from hpi-swt2/new-style

New style