Fix after all the reviews :
• rename module unique_supplier_invoice_number to account_invoice_unique_supplier_invoice_number
• remove logos
• add .pot file to both modules  account_invoice_unique_supplier_invoice_number and account_invoice_unique_customer_ref
• add fr translation to both modules
• fix typo '# this function only works with one id' in both modules
• fix the missing spaces in the licence text for both modules
• fix the too long lines