Fix language selection

Use "REQUEST_URI" instead of the "PHP_SELF" sever variable to determine
the redirection URL for the language selection form. This fixes the
language selection feature to work well with virtual URLs.
Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

web/template/header.php

@@ -29,7 +29,7 @@
 
 		<div id="content">
 			<div id="lang_sub">
-				<form method="get" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"], ENT_QUOTES) ?>">
+				<form method="get" action="<?php echo htmlspecialchars($_SERVER["REQUEST_URI"], ENT_QUOTES) ?>">
 					<fieldset>
 						<div>
 							<select name="setlang" id="id_setlang">