How to: send notifications to store owner in other language (than english)

If like me you can not send admin notifications (order, review, quantity below, ...) in a language other than english even if the templates exist, here is the solution:

UPDATE Nop_Setting SET Value = [[LANGUAGE ID]] WHERE Name = 'Localization.DefaultAdminLanguageID'

By default, it's set to 7 (english).
If you are looking for an example, have a look at OrderService.cs and search for:

messageService.SendOrderPlacedStoreOwnerNotification(order, localizationManager.DefaultAdminLanguage.LanguageId);

Thanks NC for this parameter!