[ticket/12061] Fix keyboard shortcut in firefox

PHPBB3-12061
[ticket/12067] Remove double scrollbar from notifications dropdown.

PHPBB3-12067
[ticket/12069] Add core.submit_post_end event

PHPBB3-12069
Merge pull request #1925 from imkingdavid/ticket/12069

[ticket/12069] Add core.submit_post_end event
[ticket/12069] Fix event documentation

PHPBB3-12069
Merge pull request #1926 from imkingdavid/ticket/12069

[ticket/12069] Fix event documentation
Merge pull request #1923 from prototech/ticket/12067

[ticket/12067] Remove double scrollbar from notifications dropdown.
[ticket/12069] Globalize  in submit_post()

PHPBB3-12069
Merge remote-tracking branch 'imkingdavid/ticket/12069' into develop

* imkingdavid/ticket/12069:
  [ticket/12069] Globalize  in submit_post()
Merge remote-tracking branch 'Elsensee/ticket/12061' into develop-olympus

* Elsensee/ticket/12061:
  [ticket/12061] Fix keyboard shortcut in firefox
Merge branch 'develop-olympus' into develop

* develop-olympus:
  [ticket/12061] Fix keyboard shortcut in firefox

Conflicts:
	phpBB/styles/prosilver/template/overall_footer.html
[ticket/11915] Move some of the #cp-main table rules to separate class.

PHPBB3-11915
[ticket/11915] Move the uploaded attachment list under the attachments tab.

PHPBB3-11915
[ticket/11915] Add row template for new attachments.

PHPBB3-11915
[ticket/11915] Provide the attachment file size to the template.

PHPBB3-11915
[ticket/11915] Provide some additional info about limits to the uploader.

PHPBB3-11915
[ticket/11915] Make it possible to display trigger_error() messages to user.

PHPBB3-11915
[ticket/11915] Add the new uploader.

PHPBB3-11915
[ticket/11915] Update the inline attachment bbcode indices on every upload.

PHPBB3-11915
[ticket/11915] Remove unnecessary JS file and include others using INCLUDEJS.

PHPBB3-11915