changelog/10.8.0_2021-07-15/38880 from owncloud/core

changelog/10.8.0_2021-07-15/38880

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Enhancement: Trigger file scan after accepting a federated share

This is necessary as we need the fileId to pass it to the `remoteshare.accepted`
event. The activity app can then hook onto this event and update the activity
by setting the correct fileId.

Also added a short translation for the SUBJECT_REMOTE_SHARE_RECEIVED activity.

https://github.com/owncloud/core/pull/38880
https://github.com/owncloud/core/pull/38889
https://github.com/owncloud/activity/issues/970