changelog/10.8.0_2021-07-15/38858 from owncloud/core

changelog/10.8.0_2021-07-15/38858

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Enhancement: Show notification if video playback is not possible on public share

Before this PR no error notification was shown if a video can't be played due
to browser incompatibility, for example, mov files on chrome.
(https://stackoverflow.com/questions/28746645)

Now we will show a dedicated notification.

https://github.com/owncloud/enterprise/issues/4632
https://github.com/owncloud/core/pull/38858