[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