Hello Patrick,
1. The problem with image maybe because the link to image is not correct or it is dropped the URL of your site so it can not be showed.
2. With the language of emails, it depends on that activated language of customers when they placed order. If they choose to browsing the site in French, then all of emails content should be in French.
Regarding both of these, I need to go to your site to check if the settings are correct or not. Please submit a new ticket to EShop category to send me the super admin account to your site so I can check.
Hope to reeceive ticket from you soon.
Sincerely, Giang