The Bug:

Dyed bundles are not translated in French.

Steps to Reproduce:

1. Create a world with the bundles experiment in creative mode
2. Set your language to the language French that is used in France. Hint: that option is "Français (France)".
3. Open up the same world you just created that has the bundles experiment.
4. Open up the creative inventory, and get any dyed bundle.
5. Notice its name is still in English.

Expected Result:

The dyed bundle would be translated.

Observed Result:

The dyed bundle is still in English, despite the game language set to French.

Notes:

Every dyed bundle is affected. 

For the issue with dyed bundles not translated in Spanish, see the related issue MCPE-186720.