SOC-4028 | [Notification Template] Implement children plugin - Apply for Social.
SOC-3972 | SOC-3969 Step 2: NOTIFICATIONS_04a For a link activity + apply Design.
SOC-4086 | [Feature Content] Implement play icon on video thumbnails.
SOC-4073 | [NEW_USER_12] The notification is not included in the digest when the user is deleted after it was created.
SOC-4074 | [CONN_REQ_14] the notification is not included in the digest If the connection request has been canceled by the requester.
SOC-4075 | [SPACE_INVIT_14] If the space invitation was canceled by a space manager, before the digest message is sent, the notification is not included in the digest.
SOC-4076 | [SPACE_REQUEST_15] If the user canceled his request before the digest message is sent, the notification is not included in the digest.
SOC-4080 | [MYSTREAM_15] If the activity was deleted before the digest message is sent, the notification is not included in the digest.
SOC-4081 | [MYSPACE_15] If the activity was deleted before the digest message is sent, the notification is not included in the digest.
SOC-4078 | [COMMENT_15] If the comment has been deleted before the digest message is sent, the notification is not included in the digest.
SOC-4077 | [MENTION_15] If the activity or the comment of the mention has been deleted before the digest message is sent, the notification is not included in the digest.
SOC-3832 | Cannot view an activity if the user is signed out
SOC-4079 | [LIKE_15] If the activity was deleted or the user unliked the activity before the digest message is sent, the notificationis not included in the digest.
Merge M1/M2 to make M2 branch. Fix bug.
SOC-3969 | Step 2: NOTIFICATIONS_04a For a link activity. Add Watch the video link.
Update dependencies version
SOC-3972 | fixed when shared link presentation Watch the video break line
Merge master to feature/social-notifications
Merge branch 'master' into feature/social-notifications

Conflicts:
	component/notification/src/main/java/org/exoplatform/social/notification/plugin/ActivityMentionPlugin.java
SOC-4202 | Email notification - thumbnail of sharing link is too big.