Merge master into feature/statbilization branch
SOC-3913: socialWidgetResources doesn't work
SOC-3959: Social Widget doesn't have latest Activity Stream
SOC-3959: Use official logo eXo
SOC-4004 | [Social Notifications] It is not easy to distinguish the activity of comment
Merge branch 'feature/stabilization'
Merge branch 'master' into feature/social-notifications
SOC-4028 | [Notification Template] Implement children plugin - Apply for social.