-<form action="{?URL?}/modules.php?module=admin&what=theme_import" method="post">
+<form accept-charset="utf-8" action="{%url=modules.php?module=admin&what=theme_import%}" method="post">
<input type="hidden" name="theme" value="$content" />
<input type="submit" name="ok" class="admin_submit" value="{--ADMIN_INSTALL_THEME--}" />
</form>