Refactoring method Notification#notify
Set mention notification as read when viewing post

  - If a mention for the current user and the displayed post exists,
    mark it as read
  - Use set_read_state instead of manually setting unread as false
Add test for mention notifications
Set sharing notification as read

  Fix issue #4951

  If the displayed user (on her profile) started sharing with the
current user, mark the notification as read
Fix hidding of poll publisher for close action
Merge pull request #5009 from taratatach/4951-sharing-notification-not-marked-as-read-when-visiting-profile

Set sharing notification as read
Merge pull request #5006 from taratatach/4940-mention-notification-not-marked-as-read-when-viewing-post

Set mention notification as read when viewing post
Merge pull request #5030 from hpetru/5029-hide-poll-input-after-post-submit

Fix hiding poll publisher for close action
minor style fix for user menu
left padding added, unnecesary cursor pointer removed
Fix self-xss issue in contact-group-rename
Fix another self-xss issue
Fix broken aspect-edit sidebar update
help page ported to bootstrap
added title_header key for the Help header, only for EN lang so far
Merge pull request #5050 from pablocubico/feature/4466-port-help-page-to-bootstrap

[4466] help page ported to bootstrap
Merge pull request #5047 from pablocubico/feature/user-menu-styles-minor-fix

[4703] Minor style fix for user menu
update changelog [ci skip]
Merge pull request #4945 from hpetru/notifications

Refactoring Notification#notify
Merge pull request #5048 from kpcyrd/fix-5031

Fix self-xss issue in contact-group-rename