Enhancement: Update owncloud Design System to v7.1.2

- Lots of updates regarding accessibility topics
- Removal of home icon in breadcrumbs, changed to "All files" link as breadcrumb root
- Added aria-labels to all landmarks in sidebar and proper logo-alt attribute to image in sidebar

https://github.com/owncloud/web/pull/5002
https://github.com/owncloud/web/pull/5044
https://github.com/owncloud/web/pull/5074
https://github.com/owncloud/web/pull/5186
https://github.com/owncloud/web/pull/5189
