[ticket/9556] Drop php closing tags, add trailing newline

Closing tags converted using Oleg's script.
remove-php-end-tags.py -a .

Trailing newlines added using the following where $ext is file extension.
find . -type f -name "*.$ext" -print | xargs printf "e %s\nw\n" | ed -s;

Extensions: php, css, html, js, xml.

PHPBB3-9556

phpBB/language/en/common.php

@@ -876,5 +876,3 @@ $lang = array_merge($lang, array(
 	'default_dateformat'	=> 'D M d, Y g:i a', // Mon Jan 01, 2007 1:37 pm
 
 ));
-
-?>