Default language is a bit broken in download pages

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@fiducial.net>
Fix FormManager password-create field for IE8
Switch spinner to spinKit double-bounce
Fix user-defined metadata: fix #431 (quotes in long text), fix choices, remove "comments feed" it's a dedicated plugin.
Remove -strip option on imagick, use -flatten instead, otherwise background is black on resize.
forgotten console.log
regexp2like function must stripslashes previously escaped chars (via preg_quote). Fix #437