Amazon Canada French requirements?

Wondering how strict are the French requirements? I was very careful with my first design making sure to include French on the label. I did this because I worried that without French my packages would be rejected at the warehouse. But now I noticed many packages on Amazon.ca don’t have French.

Would I meet the requirements if I have French on the back of the package only? Or must it also be on the front? Or is not important to even include it?