* develop: (93 commits)
[ticket/10157] Add notification to update cpfs when installing a language.
[ticket/10185] Always set board startdate on conversion
[ticket/10419] Reword the language strings
[ticket/9361] View correct error messages when editing account information
[ticket/10457] Undefined variable $request, when print-viewing PMs
[ticket/10452] Fix xHTML errors when print-viewing PMs
[ticket/9066] Move regex into get_preg_expression function and add tests
[ticket/10254] Add "phpBB Group" to "Modified by" in prosilver stylesheet.css
[ticket/10254] Removing the subsilver2 NOTE, incompatible with phpBB.com.
[ticket/10254] Removing the NOTE as it is incompatible with phpBB.com.
[ticket/10254] Remove subsilver2 as default style on theme.
[ticket/10254] Remove style names from themes and fix some informations on it.
[ticket/7138] Allow simple header and footer for trigger_error() messages
[ticket/9066] Disallow some database prefix to prevent same errors and problems
[ticket/10365] Fix up S_POST_UNAPPROVED check, make it easier to read
[ticket/10437] Do not display announcements that are waiting for approval
[ticket/10087] Organize bans in acp_baninto optgroups
[ticket/8616] Include old U_INBOX var for BC
[ticket/10435] Remove global announcement from forums total topic count
[ticket/10435] Readd local announcements to total topic count in viewforum
...
Conflicts:
phpBB/install/database_update.php
addf81f62e