When I put together a cabinet, it had several different languages on the instructions. I just tossed them in the trash, it’s no big deal. Almost everything you buy has several sets of directions in different languages.
Businesses are already doing it and no one cares about continuing to print instructions or caution labels in French. I seriously doubt Trump had read instructions or caution labels of any kind in 20 years.
But Trump loves tariffs because he can pick winners and losers and force businesses to grovel at his feet and collect kick backs. What better way to get kickbacks than messing with the trade deal for our largest trading partner.
There is likely some other play to enrich himself at hand. Dissing the French labeling is a great way to sabotage a deal to enable that play.