Added translation of email templates

remove unused constant events

fix wrong integration in product template

fix #128

Factorized URL desactivation in UrlRewritingTrait::markRewritenUrlObsolete()

Fixed nt,-group css rule which caused garbage in top bar buttons

Adding translation for Backoffice

Adding translation for Backoffice

Adding translation for Backoffice

Translation : Ordering existing translations by keys. This should ease the merge process when conflicts occur

Translation : Ordering existing translations by keys. This should ease the merge process when conflicts occur