Resolve "StEP00348: Responsive Navigation Stud.IP 5.x"

app/controllers/oer/market.php

app/views/profile/extern.php

app/views/profile/index.php

lib/classes/ContentBar.php

lib/classes/ResponsiveHelper.php

lib/classes/SkipLinks.php

lib/classes/WidgetContainer.php

lib/classes/sidebar/Sidebar.php

lib/include/html_head.inc.php

lib/modules/ConsultationModule.class.php

lib/modules/CoursewareModule.class.php

lib/navigation/FooterNavigation.php

lib/wiki.inc.php

public/assets/images/icons/black/focusmode-off.svg

public/assets/images/icons/blue/focusmode-off.svg

public/assets/images/icons/blue/fullscreen-off.svg

public/assets/images/icons/blue/fullscreen-off2.svg

public/assets/images/icons/blue/fullscreen-off3.svg

public/assets/images/icons/blue/fullscreen-on.svg

public/assets/images/icons/blue/fullscreen-on2.svg