Merge pull request #1666 from cyberalien/ticket/11795

Move JS from html files to forum_fn.js
[ticket/11844] update acp/authentication language var

the language var ACP_AUTH_SETTINGS_EXPLAIN in language/en/acp/board.php

PHPBB3-11844
Merge remote-tracking branch 'Prosk8er/ticket/11844' into develop

# By Prosk8er
# Via Prosk8er
* Prosk8er/ticket/11844:
  [ticket/11844] update acp/authentication language var
[ticket/11735] Display disabled checkbox when notification is already read

PHPBB3-11735
Merge remote-tracking branch 'dhruv/ticket/11735' into develop

* dhruv/ticket/11735:
  [ticket/11735] Display disabled checkbox when notification is already read
[ticket/11735] Display disabled checkbox in subsilver for read notifications

PHPBB3-11735
Merge remote-tracking branch 'dhruv/ticket/11735' into develop

* dhruv/ticket/11735:
  [ticket/11735] Display disabled checkbox in subsilver for read notifications
[ticket/11848] Load modules from filesystem rather than DB

PHPBB3-11848