Download invoice in local language.

As a manager of company in Bulgaria i need to be able to provide my invoices in "local" language (Bulgarian) to my accountant. (This problem is quite common in Eastern countries that must provide the invoices in local language to the accountancy and the invoices in client language to their clients). For this i would like to be able to provide an access to the company invoices to my accountant and allow her to download the invoices in the local language (BG) easily without to have to setup some additional solutions than the software. Unfortunately the actual system only display and allow to download invoices in the client "locale" (for example French) as soon as the client locale is set. For this i propose to modify the way the backend is rendering the invoices and enable the possibility to generate the invoice with the locale of the company if the endpoints are provided with a specific parameter. This would allow to create a new menu in the front ui "Dow…