Merge pull request #1153 from djfm/1.6

English strings harmonization
Update to the option labels and descriptions
Merge pull request #1155 from xBorderie/patch-2

Update to the option labels and descriptions for AdminOrderPreferences
[-] BO : Add responsive process to controller
Merge pull request #1156 from djfm/1.6

// some more English strings harmonization
[-] FO : OrderOpcController Fix wrong hook
// small fix
[-] BO : switch clicable on adminthemes
Merge remote-tracking branch 'origin/1.6' into 1.6
// Trads
// add red color on minimum amount in opc page
[*] BO: updating option labels et descriptions for AdminPPreferences.
[-] BO : Add page header toolbar title for import and export theme
Merge pull request #1157 from xBorderie/patch-3

[*] BO: updating option labels et descriptions for AdminPPreferences.
[+] CORE : HelperTreeCategories - Add input name variable
[*] BO: updating option labels et descriptions for AdminPPreferences (2).
// fixtures
Merge branch '1.6' of https://github.com/PrestaShop/PrestaShop into 1.6
Merge pull request #1158 from xBorderie/patch-4

[*] BO: updating option labels et descriptions for AdminPPreferences (2)...
[*] BO: updating option labels et descriptions for AdminCustomerPreferences.