Notifications: Wrong author for Timeline post notification.

[AntonLV]

1. User1 follows User2.
2. User3 makes a direct post on User2's timeline.
3. User1 receive such notifications:
   3.1. User2 added a timeline post 'Another test post fr...'
   3.2. New post 'Another test post fr...' in User2 profile timeline
   Both notifications have thumbnail of User2.

[AntonLV]

Related issue:
Timeline owner doesn't receive a notification when his timeline received a new Direct post.

[AntonLV]

Execute the following query in the next update script:

UPDATE `bx_notifications_events` SET `content`=REPLACE(`content`, 's:8:"lang_key";s:34:"_bx_timeline_ntfs_txt_object_added";', 's:8:"lang_key";s:0:"";') WHERE `content` LIKE '%_bx_timeline_ntfs_txt_object_added%';

[AntonLV]

Added in update script.