#195 done Enhancement
#184 Made first/lastname immutable in the _form, since this was changed back by some refactoring in #111
#187 Added asterisks and conditional description
- reworked the navbar #189
- some minor changes
Merge branch 'develop-js' of github.com:tkowark/hpi-hiwi-portal into develop-js

Conflicts:
	app/controllers/students_controller.rb
fixed cv link for student
link is now extended to filename
#185 Made enhancement + fixed a student routing test
Merge branch 'develop-js' of https://github.com/tkowark/hpi-hiwi-portal into develop-js-mail

Conflicts:
	app/assets/stylesheets/application.css
	app/assets/stylesheets/applications.css.scss
	app/controllers/application_controller.rb
	app/controllers/chairs_controller.rb
	app/controllers/users_controller.rb
	app/views/chairs/_form.html.erb
	app/views/faqs/_form.html.erb
	app/views/job_offers/_form.html.erb
	app/views/layouts/application.html.erb
	app/views/staff/_form.html.erb
	app/views/students/_form.html.erb
	config/locales/views/layouts/de.yml
	config/locales/views/layouts/en.yml
	spec/controllers/students_controller_spec.rb