[ticket/12638] Use require if phpbb_require_updated isn't available

PHPBB3-12638
[ticket/11711] Inform user of unsupported characters while posting

PHPBB3-11711
[ticket/11711] Improve checks for unsupported characters and check subject

PHPBB3-11711
[ticket/11711] Reduce size of tests and also test topic titles

PHPBB3-11711
[ticket/11711] Improve coding and comments of character check

PHPBB3-11711
[ticket/12699] Add tab key to keymap

PHPBB3-12699
[ticket/12553] Move Place inline and Delete buttons left of the file name.

PHPBB3-12553
[ticket/12553] Align contact icons to the right.

PHPBB3-12553
[ticket/12553] Fix links in the last post column that are not clickable.

The relative position of the <dt> is causing it to sit atop of the <dd> thus
preventing the user from clicking the links. The <dl> has a relative position
in LTR, which takes care of containing the read/unread icon link that has an
absolute position. We no longer support IE6, so removing the tweak that sets
the <dl> position to static will make everything behave the same way in RTL as
in LTR.

PHPBB3-12553
[ticket/12553] Remove incorrect size for site logo.

The logo is displayed standalone, so there is no need to change the padding
from the left side to right.

PHPBB3-12553
[ticket/12553] Align alert text to the right.

PHPBB3-12553
[ticket/12553] Fix incorrect alignment in ACP responsive tables.

PHPBB3-12553
[ticket/12553] Fix alignment of contact icon.

PHPBB3-12553
[ticket/12553] Open the notification dropdown to the left.

PHPBB3-12553
[ticket/12553] Center the responsive CP menus instead of floating right.

PHPBB3-12553
[ticket/12553] Align the text in responsive tables to the right.

PHPBB3-12553
[ticket/12553] Fix the responsive topic/forum lists.

PHPBB3-12553
[ticket/12553] Fix dropdown position of live search

PHPBB3-12553
[ticket/12553] Fix the merge topic list.

PHPBB3-12553
[ticket/12553] Remove dropdown-trigger class from member search input.

PHPBB3-12553