* develop-olympus:
[ticket/11769] Allow using 0 as poster name
[ticket/11769] Allow '0' as username
[ticket/11769] Allow '0' as username in notification mails
[ticket/11769] Fix language issues in the doc blocks
[ticket/11769] Correctly supply the post author's username in posting.php
Conflicts:
phpBB/includes/functions_posting.php