[*] BO: updating option labels et descriptions for AdminPerformance.
[*] BO: updating option labels et descriptions for AdminEmails.
[*] FO : movde header id to classes
Merge pull request #1181 from xBorderie/patch-2

[*] BO: updating option labels et descriptions for AdminPerformance.
[+] FO : js and css files in the autoload directory in the theme are now loaded (via CCC) automatically
Merge branch '1.6' of https://github.com/PrestaShop/PrestaShop into 1.6

Conflicts:
	themes/default-bootstrap/header.tpl
Merge pull request #1182 from djfm/1.6

// added sprintf to correctly handle plural case
// removed unnecessary escape char causing failure of translation
// removed useless override: this file is displayed in Back-Office only