Resolve "Polishing für die neue HTML-Stuktur" Teil 1

lib/classes/TwoFactorAuth.php

resources/assets/javascripts/lib/skip_links.js

resources/assets/stylesheets/scss/article.scss

resources/assets/stylesheets/scss/header.scss

resources/assets/stylesheets/scss/layouts.scss

resources/assets/stylesheets/scss/mobile.scss

...urces/assets/stylesheets/scss/personal-notifications.scss

resources/assets/stylesheets/scss/responsive.scss

resources/assets/stylesheets/studip.scss

resources/vue/components/responsive/ResponsiveContentBar.vue

templates/contentbar/contentbar.php

templates/footer.php

templates/header.php