Enhancement: Update ownCloud Web to v5.0.0

Tags: web

We updated ownCloud Web to v5.0.0. Please refer to the changelog (linked) for details on the web release.

https://github.com/owncloud/ocis/pull/2895
https://github.com/owncloud/ocis/pull/3157
https://github.com/owncloud/web/releases/tag/v4.8.0
https://github.com/owncloud/web/releases/tag/v5.0.0
