5.4.4

[*] updated user guide
[*] UX improvements : hide tabs with settings while account is not connected
[*] orders created with error connected to Mailchimp module
[*] do not show shortcut buttons if the quantity of products in cart is more than in stock
[*] issue with shortcuts on the checkout page
[*] issue with JS while adding a widget "paypal shorcut" on the checkout page
[*] Issue with checkout in PS1.7.2 github issue #107
[*] BN code for "Pay in X banner" for Germany