[ticket/10174] Rename "Ban usernames" to "Ban users" in ACP

Changing the language string from "Ban usernames" to "Ban users"
to clarify its use. It bans users by their name and not the username itself

PHPBB3-10174
[ticket/12302] Updated composer.phar to 1.0.0-alpha8

wget -N https://getcomposer.org/download/1.0.0-alpha8/composer.phar

PHPBB3-12302
[ticket/12302] Added `--no-dev` to composer call in build.xml

PHPBB3-12302
[ticket/12309] Template Event quickreply_editor_panel_before/after

Being able to wrap the quickreply editor can be handy (especially if we
want to make a hide/show toggle button). And having an extra event
inside the form itself can also be handy.