[ticket/11144] Add missing {FORUM_NAME} variable

The template variable {FORUM_NAME} was missing from
the login page of a password protected forum

PHPBB3-11144
[ticket/11144] Add missing {FORUM_NAME} variable

Replace spaces with tabs

PHPBB3-11144
Merge remote-tracking branch 'MGaetan89/ticket/11144' into develop-olympus

* MGaetan89/ticket/11144:
  [ticket/11144] Add missing {FORUM_NAME} variable
  [ticket/11144] Add missing {FORUM_NAME} variable
Merge branch 'develop-olympus' into develop

* develop-olympus:
  [ticket/11144] Add missing {FORUM_NAME} variable
  [ticket/11144] Add missing {FORUM_NAME} variable

Conflicts:
	phpBB/download/file.php
	phpBB/styles/prosilver/template/login_forum.html