Merge pull request #532 from bibich/improvements

small corrections and improvements, especially on the backoffice template.
fix redirect current_tab
With the change of page configuration/variables which display title message of variables, here the French translations to insert when creating a new shop.
2.0.3 update script is also modified.
Merge pull request #536 from Alban-io/patch-1

fix redirect current_tab in product edit page
Merge pull request #537 from jodeq/master

Add missing french translation for config_i18n
renamed template in gabarit for french translation in back office
Fixed translations for coupon
Fixed typo
Added missing translation
Added possibility to change the main product reference
Fixed typo